Einstein, H.H., Azzouz, A.S., Schwartz, C.W., and Steiner, W. (1979). Improved Design of Tunnel Supports: Executive Summary. Massachusetts Institute of Technology, Department of Civil Engineering. Prepared for U.S. Department of Transportation, Urban Mass Transportation Administration, Office of Rail and Construction Technology, Transportation Systems Center. Report No. UMTA-MA-06-0100-79-15, 49 pages, December 1979.