Hubert Decleer, The Melodious Drumsound All-Pervading, Sacred Biography of Rwa Lotsâwa: About Early Lotsâwa Rnam-thar and Chos-'byung, contained in: Tibetan Studies: Proceedings of the 5th Seminar of the International Association for Tibetan Studies, Narita 1989, Naritasan Shinshoji (Narita 1992), vol. 1, pp. 13-28.