Arthur E. Link, The Earliest Chinese Account of the Compilation of the Tripiṭaka (I), Journal of the American Oriental Society, vol. 81, no. 2 (April 1961), pp. 87-103, at pp. 98 ff. He was disciple of Śāriputra. Here spelled Gavāmpati.
Mvy., no. 1051 spells his name Gavāṃpati, and supplies the Tibetan version Ba lang bdag [~Ba glang bdag po?]. Same in Obermiller's tr. of Bu-ston's history, p. 73.
John S. Strong, The Development of a Cult: Gavampati in South and Southeast Asia. Paper given at AAR in 2004.
He is credited with spreading Buddhism in S.E. Asia. The Mahākarmavibhaṅga says that he "converted people in... the Golden Land [Suvarṇabhūmi]." The Sāsanavaṃsa says he was the first to teach Buddhism in the Mon kingdom of Thaton. Françoise Lagirarde, entry in Buswell's EoB, pp. 301-302.
Françoise Lagirarde, Gavampati et la tradition des quatre-vingts disciples du Bouddha: textes et iconographie du Laos et de Thaïlande, Bulletin de l'Ecole Française d'Extrême-Orient, vol. 87, no. 1 (2000), pp. 57-78.