rDzogs-chen tantra elaborating on the identity of pristine cognitivity (rig pa) with the ultimate stratum of ontological reality (dharmakāya) and the overcomming of obstacles to realizing it., Text acquired in Tibet by HRH Prince Peter of Greece and Denmark (1908-1980)., Philosophy text recoved by gter ston rGod kyi Ldem 'phru can, and Catalogue of Tibetan manuscripts and xylographs by Hartmut Buescher and Tarab Tulku. Copenhagen: Curzon – Det Kongelige Bibliotek, 2000. Vol. 1. p. 116