EVOLUTION OF KEROGEN IN THE OIL-GAS FORMATION IN THE PALAEOZOIC SEDIMENTS OF SHAANXI-GANSU-NINGXIA BASIN
Fan Pu, Shen Ping, Rong Guanghua, Wang Hongyong, Ye Jisun
Oil & Gas Geology . 1980, (1): 47 -55 .  DOI: 10.11743/ogg19800106