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. A Bolt of Lightning from the Blue—The Vast Commentary on Vajrakila That Clearly Defines the Essential Points. Berlin: Edition Khordong, 2002, p. 107 - 142.