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ON SOLUBILITY OF SPHALERITE AND PYRRHOTINE IN AMMONIUM CHLORIDE SOLUTION UNDER HIGHTENED TEMPERATURES.PTICYN AB.1968; AKAD. NAUK S.S.S.R., SIB. OTD., GEOL. GEOFIZ ; SUN; 1968, NUM. 0005, P. 116 A 117Miscellaneous
