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Nikolay Zhechev. PROBLEMS OF ECOLOGY AND SECURITY IN THE CONTACT AREA BETWEEN OLD AND NEW TUNNELS. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Science and Technologies in Geology, Exploration and Minining, 2018, pp. 585-592. https://doi.org/10.5593/sgem2018/1.2/s02.074
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Nikolay Zhechev. PROBLEMS OF ECOLOGY AND SECURITY IN THE CONTACT AREA BETWEEN OLD AND NEW TUNNELS. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Science and Technologies in Geology, Exploration and Minining, 2018, pp. 585-592. https://doi.org/10.5593/sgem2018/1.2/s02.074