1. Heat-assisted tunnel-boring machines;Carstens;UARL Report No. J970802-13, Final Report on U.S. DoT Contract No. FR-9-0035,1970
2. Research investigation of laser rock kerfing;Carstens;UARL Report L-911329-8, Final Report on U.S. DoT Fed. Railroad Admin. Contract No. DoT FR-20021, NTIS No. PB-214439/2,1972
3. Rock kerfing with high-power lasers;Jurewicz,1974
4. Focused laser beams to assist rock excavation;Jurewicz;UARL Report N-971543-11, Final Report on U.S. DoT Fed. Railroad Admin. Contract No. DoT FR-20021, NTIS No. FRA-ORDSD-75-20,1974
5. Closed-cycle performance of a high-power electric discharge laser;Brown;Appl. Phys. Let.,1972