The Yibuzong lun lun; Samaya-bhedoparacana cakra （Treatise of the Wheel of the Different Divisions of the Tenets）. One fascicle， T 2031.49.15-17. Attributed by the Tibetan tradition to Vasumitra 世友， translated by Xuanzang 玄奘 in 662. Earlier translations were done by Parama^rtha and Kuma^raji^va. It contains an overview of the twenty early schools of Indian Buddhism from a Sarva^stiva^da standpoint. .