PERMIAN AND TRIASSIC CONODONT COLOUR ALTERATION AND ITS PETROLEUM GEOLOGICAL SIGN下ICANCE IN GUIZHOU PROVINCE
Zhou Xi-yun
西南石油大学学报(自然科学版) . 1985, (3): 1 -13 .  DOI: 10.3863/j.issn.1000-2634.1985.03.001