Author: Blo-gros-mthaʾ-yas, ʾJam-mgon Kon-sprul.
The ultimate mahayana explanatory text on The changeless nature (the mahayana uttara tantra shastra), Arya Maitreya & Asanga. ISBN 090618102X. Published by Kagya Samye in 1979. Publication and catalogue information, links to buy online and reader comments.