Karous, M. (1970): Urcovani mocnosti nadlozi odporovym profilovanim se dvema rozestupy Determination of the overburden thickness by resistivity profiling with two different electrode separations. Zamestnavatelsky Svaz Dulniho a Naftovho Prumyslu, Prague, Czechoslovakia, Geologicky Pruzkum, 12 (2), 43-46, georefid:1976-015495