Thugs sgrub drag po rtsal gyi chos skor : a cycle of practice focussing upon the esoteric form of the Guru from the Byaṅ gter revelations of Rig-ʼdzin Rgod-kyi-ldem-ʼphru-can - Rgod-kyi-ldem-ʼphru-can, Gter-ston, 1337-1408 (Bari Longsal Lama, 1980)