Note 63 — LECTURE VII. Changes in Buddhism and its disappearance from India.
Reading edition
The Vaibhāshika was divided into Sarvāstivāda (assertion of the real existence of all things), Mahāsaṅghika, Sammatīya (said to have been founded by Upāli), and Sthavira; the Sautrāntika had also its own subdivisions.