1. Formation density logging, gamma-gamma, principles and practice;Tittmann,1962
2. Physical possibilities of gamma-gamma logging;Czubek,1966
3. Determination of ore concentration in exploration holes by the gamma-ray backscattering technique;Donhoffer,1969
4. Application of one-dimensional transport theory to the subsurface gamma-scatter density probe;Christensen;Nucl. Instr. and Meth.,1971
5. Comparison of Monte Carlo calculations of the parameters governing the response of the nuclear soil density gauge with experimentally obtained values;Heinz,1966