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Rock Mechanics, Vol. 3, 99–112, 1971.
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Baar, C.A. Discussion to the paper by H. Habenicht “Maschineller Streckenvortrieb im Bergbau—Entwicklung und Probleme” (“mechanical tunnel driving in mines — development and problems”. Rock Mechanics 3, 239–241 (1971). https://doi.org/10.1007/BF01238183
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DOI: https://doi.org/10.1007/BF01238183