Glemser, O., Butenuth, G., 1953, Wechselwirkung von Elektronen mit festen Stoffen, Naturwissenschaften, v. 40, No.19, pp. 508-509
Butenuth, G., Glemser., O., Koch, K., 1954, Über organische Folien mit hoher Resistenz gegen Elektronenstrahlen, Naturwissenschaften, v. 41, No. 21, pp. 499-500
de Freitas, M. H., 1972. Some aspects of cliff failure in south-west England. Proceedings Ussher Society, 2: 388-397.
de Freitas, M. H. & Watters, R. J., 1973. Some field examples of toppling failure. Geotechnique, 23: 494-513.
Butenuth, G., Funke, K. H., 1975, Spezifisches Volumen gefuellter, peroxidvernetzter Naturkautschukvulkanisate, Angewandte Makromolekulare Chemie. 44, Issue 1,
pp. 185-190
Wijeyesekera, D. C. & de Freitas, M. H., 1976. High pressure consolidation of kaolinitic clay. Proceedings American Association Petroleum Geologists, 60: 293-298.
Butenuth, C., Butenuth, E., Ruetten, B., 1977, Characterization of heat-treated Fe sub 2 O sub 3 materials--sample properties and solution kinetics…, Berichte der Deutschen Keramischen Gesellschaft, v. 54, no. 3, pp. 73-78.
Butenuth, G., Kryschi, R., Schiebahn, H.J.R., Wesser, J., 1979, Zur zeitlichen Intensitätsänderung von Beugungsreflexen bei der Entwässerung von Salzhydraten, Colloid & Polymer Science, v. 257, No. 4., pp. 434-436
Carvalho, J. A. R. & de Freitas, M. H., 1982. Site investigation: costs and benefits. Consulting Engineer, 46 (No 4): 11-12 and (No 5): 15-16.
Dobereiner, L. & de Freitas, M. H., 1985. Geotechnical properties of weak sandstones. Geotechnique. 36: 79-94.
VVackemagel, H.; C. Butenuth, 1987, Characterisation d'anomalies géochimiques par la géostatistique multivariable. Symposium International d'Exploration Géochimique,
Xu, S. & de Freitas, M. H., 1988. Use of a rotary shear box for testing the shear strength of rock joints. Geotechnique, 38: 301-310.
Lee, S. G. & de Freitas, M. H., 1988. Quantitative definition of highly weathered granite using the slake durability test. Geotechnique, 38: 635-640.
Lee, S. G. & de Freitas, M. H., 1989. A revision of the description and classification of weathered granite and its application to granites in Korea. Quarterly Journal Engineering Geology, 22: 31-48.
Butenuth C.& de Freitas, M. H., 1989. Phase analysis of preferentially carbonatic rocks: a new application of thermodynamics. TIZ: Magazin fuer Verfahrenstechnik (TIZ: Magazine for Powder, Granules and Bulk Solids Technology ), 113, 194.
Butenuth, C. & de Freitas, M. H., 1989. Umsatz von Wasserstoffionen an der Oberflaeche kristalliner Minerale System: (1011) - Fläche von Calcitkristallen und wässriger Phase, Teil 1. Wissenschaft und Umwelt: 1: 11-13.
Sadagah, B.H. & de Freitas, M. H., 1989. Design charts for rock-cut slopes along motorways in southern Saudi Arabia. Journal of the King Abdulaziz University (Earth Sciences), 2, 119-145.
Butenuth, C.; M. H. de Freitas, 1989. Studies of die influence of water upon calcite, “Chalk”; Proc. Int. Chalk Symposium, Brighton, 103-108
Butenuth C.; M. H. de Freitas, 1989. Umsatz von Wasserstoffionen an der Oberfläche kristalliner Minerale System: (1011)-Fläche von Calcitkristallen und wässriger Phase, Teil 1. Wissenschaft und Umwelt (ISU), I:11-13
Butenuth, C.; M. H. de Freitas; G. Butenuth, 1990. A systematic approach to study chemical dissolution and concomitant physical disintegration of rock for construction, Proc. 25th Int. Congr., Int. Assoc. Engineering Geology, 4. 3037-3044
Butenuth C. & de Freitas, M. H., 1991. A quantitative approach for describing rocks. Geophysik und Geologie, (Univ.Leipzig), IV, 111-120.
Butenuth, C. & de Freitas, M. H., 1991. Reindichte von Gesteinen. Zeitaufwand und Genauigkeit ihrer pykno-metrischen Bestimmung mit n-Heptan als Messfluessigkeit, Geophysik und Geologie (Univ. Leipzig), IV, 121-126.
Butenuth, C., de Freitas, M. H., Kasig, W., Butenuth, G., & Frey, M.-L., 1992. Chemically induced crack formation, an intermediate stage of rock weathering, Part I - Survey on principal surface reactions. Wissenschaft und Umwelt, 4, 261-266
Butenuth, C., de Freitas, M. H., Kulik, A., & Schetelig, K., 1992.Chemically induced crack formation, an intermediate stage of rock weathering, Part II - Angular dependence of velocity and reflectance of acoustic waves on crystals with anisodesmic lattice structure. Wissenschaft und Umwelt, 4, 267 - 276
de Toledo, P. & de Freitas, M. H., 1993. Laboratory testing and parameters controlling the shear strength of infilled rock joints, Geotechnique, 43, 1-19.
Butenuth, C, de Freitas, M. H., Al-Samahiji, D. K., Park, H. D., Cosgrove, J. W. & Schetelig, K., 1993. Technical Note: Observations on the measurement on tensile strength. Int. J. Rock Mech. Min. & Geomech. Abstr., 30, 157 - 162
Pereira, J. P. & de Freitas, M. H., 1993. Mechanisms of shear failure in artificial fractures of sandstone and their implication for models of hydromechanical coupling. Rock Mech. & Rock Engng., 26, 195 - 214.
Butenuth, C., de Freitas, M. H., Park, H. D., Cosgrove, J. W., Schetelig, K., van Lent, P., & Grill, P., 1993. Technical Note: Observations on the use of the hoop test for measuring the tensile strength of anisotropic rock. Int. J. Rock Mech. Min. & Geomech. Abstract, 31, 733-741
Butenuth ,C.; M. H. de Freitas; H. D. Park; K. Schetelig; P. van Lent; P. Grill, 1994. Technical Note, Observations on the use of the Hoop Test for measuring the tensile strength of anisotropic rock. , Int. J. Rock Mech. Min. Sci. & Geomech. Abstr. Vol. 31, No. 6: 733 - 741
Frey, M.-L.; C. Butenuth; W. Kasig; G. Butenuth, 1994. Colloidal silicic acids in hydrogeochemical systems and the role of gel-flocks as vehicle for environmental poisons, Poster Session, Sedimentologisches Colloquium, Aachen
Butenuth, C.; M.- L. Frey; M. H. de Freitas, 1994. Kieselsäure als Bindemittel in Buntsandsteinproben der Südeifel Vorläufige Beobachtungen, Poster Session, GUG, Heidelberg
Butenuth, C., de Freitas, M. H. & Schetelig, K. 1995. Newer observations and experiments on interactions between mineral surfaces and aqueous solutions in geological systems. Wissenschaft und Umwelt. (No 1) 43 -52
Azzoni, A., & de Freitas, M. H., 1995.Experimentally gained parameters, decisive for rock fall analysis. Rock Mech. & Rock Engng., 28,111-124.
de Toledo. P, & de Freitas M. H. 1995 Discussion; Laboratory testing and parameters controlling the shear strength of filled rock joints. Geotechnique. 45,175-183
Passas, N.; C. Butenuth: M. H. de Freitas, 1995, The effect of solid-liquid interaction in measuring rock density and porosity. Abstract in Terra Nova, 7 (supplement), pp. 192
Butenuth,C.; M. H. de Freitas, 1995, The character of rock surfaces failed in mode I.
Special Publication of the Geological Society of London: Fractography: Fracture topography as a tool in fracture mechanics and stress analysis; Editor; M. S. AMEEN, No. 92, 83 - 96
Butenuth, C.; .M-L. Frey, 1995, Geschwindigkeit diagenetischer Wiederverfestigung von Rutschmassen des Buntsandsteins von Mürlenbach, Südeifel, Wissenschafl and Umwelt (ISU), I.53 - 55
Butenuth, C.; K. Schetelig; M. H. de Freitas 1995, Bildung, Stuktur and Festigkeit von Sandsteinen sowie qualitative Versuche zu ihrer Modellierung 10., Nationale Tagung ftlr Ingenieurgeologie, Freiberg, 272 - 278
Passas, N.; C. Butenuth; M. H, de Freitas; M. S. King, 1995, Relations between p-wave velocities and pore characteristics in Penrith sandstone 10. Nationale Tagung für Ingenieurgeologie, Freiberg. 295 - 302
Butenuth, C.; M- L. Frey ; M. H. de Freitas; N. Passas; C. Duenas,1995, Mechanical property changes of gels: a possible explanation for some slope failures, Proceedings of the 31st Congress of the Engineering Geology Group of the Geological Society
Boltze, U., & de Freitas, M. H. 1996. Changes in atmospheric pressure associated with dangerous emissions from gas generating disposal sites. The “explosion risk threshold” concept. Proc. Instn. Civ. Engrs. Geotech. Engng. 119, 177-181.
Valdeon, L.; de Freitas, M. H.; & King, M. S. 1996 Assessment of the quality of building stones using signal processing procedures Quarterly Journal of Engineering Geology, 29, 299 - 308
Passas, N., Butenuth, C., de Freitas, M. H., & Buntanova, V. 1996 Technical Note: Rock porosity determinations using particle densities measured in different fluids Geotechnical Testing Journal, 310 - 315
Passas, N., Butenuth, C., de Freitas, M. H. 1996 A non-volumetric method of measuring the ratio of solid and voids in porous material with a computer aided system. Bulletin of the Association of Engineering Geology, No.53, 83 - 95.
Boltze, U. & de Freitas M. H. 1997, Monitoring Gas Emissions From Landfill Sites.Waste Management & Research. 15, 463-476.
Butenuth, C. ,1997. Technical Note, Comparison of tensile strength values of rocks determined by point load and direct tension tests, Rock Mechanics and Rock Engineering. vol. 30, no. I , 65 – 72
Passas, N., Butenuth, C. & de Freitas, M. H. 1998 Strain associated with failure in tension for a porous rock. Bulletin of the Association of Engineering Geology and the Environment. 57,31-40.
Yeo. I. W.; de Freitas. M. H. & Zimmermann. R. W. 1998. Effect of shear displacement on the aperture and permeability of a rock fracture, Int. J. Rock Mech. Min. & Geomech. Abstracts. 35, 1051 - 1070.
Butenuth, C., Frey, M. L., de Freitas, M.H., Passas, N., Furero-Duenas, C., 1998, Silica gels: a possible explanation for slope failures in certain rocks, Geological Society, Engineering Geology Special Publications, v. 15, p. 185-191
Al-Derbi, M. S. & de Freitas, M. H. 1999 Use of the Boussinesq equation for determining the distribution of stress within a diametrical point load test. Rock Mechanics & Rock Engineering. 32, 257-265.
de Freitas, M. H., Butenuth, C., & Khodaii, A. 2000. On the micromechanics of crushable aggregates; Discussion of paper by McDowell G. R. M. & Bolton M. D. Geotechnique. 50, 315-318.
Butenuth, C., Hamm T., & de Freitas, M. H. 2004. The response of rock to water vapour. Bull. Engineering Geology & the Environment, (Accepted for publication)
de Freitas, M. H., & Zacharopoulos, A. 2004. Geotechnical description of six unsaturated carbonate soft rocks and their basic sorption kinetics. Engineering Geology, (Submitted for publication)
de Freitas, M. H., Butenuth, C., & Khodaii, A. 2004 The bonding of sand and gravel as a function of time. Engineering Geology, (Submitted for publication)
Butenuth C, 2004, Report on “Educational Experiment” at Imperial College, Journal of Professional Issues in Engineering Education and Practice, v. 130, Issue 1,
pp. 8-10
Butenuth, C., Hamm, T., de Freitas, M. H., 2004, The kinetic response of rock to water vapour, Bulletin of Engineering Geology and the Environment, v. 63, No. 3, pp. 179 - 189
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