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Kumar, Sudhir and Bandopadhyay, L.K. and Kumar, Arvind (2003) Improvised wireless communication system for underground coal mines utilizing active antenna. Minetech, 24 (1). pp. 38-41. ISSN 0970-7204

Srivastava, S.C. and Shastry, B.S.R. and Kumar, Sudhir (1980) Economic Consideration in planning complete communication system for a mine. Journal of Mines, Metals & Fuels, 28 (11). pp. 249-257. ISSN 0022-2755