Einstein, H.H. (1984). Design and construction of tunnels in swelling rock. AIME/SME Transactions. American Institute of Mining, Metallurgical, and Petroleum Engineers. Retrieved from http://www.onemine.org/document/abstract.cfm?docid=7964
Einstein, H.H. (1984). Design and construction of tunnels in swelling rock. AIME/SME Transactions. American Institute of Mining, Metallurgical, and Petroleum Engineers. Retrieved from http://www.onemine.org/document/abstract.cfm?docid=7964