REFERENCES
- MARTIN (DJR). Full Coverage of the Mine by line-propagated by VHF. Radio Mining Technology. Nov. 1970; 7–15.
- LARGE (DB), BALL (L) and FARSTAD (AJ). Radio Trans mission to and from Underground Coal Mines. Theory and measurement. IEEE Trans. CS21, 3; 1973; 194–202.
- DAVIS (QV) and MARTIN (DJR). Radio Communication by leaky feeders. Electronics and Power. 3rd Oct., 1974; 753–754.
- NAGRATH et al. Signalling for Hoist Operations in Mines. (to be published).