Zakharov & Pavlov 1986. The first find of araxoceratid ammonoids within the Permian of the east of USSR. Zakharov, Yu.D.[Ed]. Permian-Triassic events during the evolution of the north-east Asia biota. Project No. 203 of the International Geological Correlation Programme., Akademiya Nauk SSSR, Vladivostok, 1986: 33-47. Chapter pagination: 74-85