TY  - CPAPER
AU  - Nikolay Zhechev
TI  - PROBLEMS OF ECOLOGY AND SECURITY IN THE CONTACT AREA BETWEEN OLD AND NEW TUNNELS
T2  - SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Science and Technologies in Geology, Exploration and Minining
PY  - 2018
SP  - 585
EP  - 592
DO  - 10.5593/sgem2018/1.2/s02.074
PB  - STEF92 Technology
ER  -