1. Determination of ash content in coal by borehole logging in dry boreholes using gamma-gamma methods;Borsaru;Geoexploration,1985
2. Coal ash determination in dry boreholes by the neutron capture technique;Borsaru;Nucl. Geophys.,1988
3. Neutron-gamma logging for iron in coal and implications for estimating the ash fusion characteristics at Callide Mine;Borsaru;Nucl. Geophys.,1993
4. A low activity spectrometric gamma-gamma borehole logging tool for the coal industry;Borsaru;Nucl. Geophys.,1994
5. Prompt neutron-gamma logging for coal ash in water-field boreholes;Charbucinski;Geophysics,1986