Phur drel bum nag
Phur Drel Bum Nak, Black Collected Words, or Black One: Hundred Thousand Word Commentary on the Kila (Wyl. phur ‘grel 'bum nag) — the seminal commentary on Vajrakilaya written by Padmasambhava, Vimalamitra and Shilamanju.
- Boord, Martin. “Black One: Hundred Thousand Word Commentary on the Kila.” In A Bolt of Lightning from the Blue—The Vast Commentary on Vajrakila That Clearly Defines the Essential Points. Berlin: Edition Khordong, 2002, 107-142.