Early teachings on the Four Phurpas in the light of the Eightfold Buddha Word, Embodying the Sugatas (bka’ brgyad bde gshegs ’dus pa) revelation of Myang ral Nyi ma ’od zer (1124-1192), and the relationship between the Revelatory (gter ma) and Transmitted (bka’ ma) Textual Traditions - Cantwell, C (Journal of Tibetology, 2022)