"The Compendium of Principles of All Tath.gatas
(Sarva-tath.gata-tattva-sa.graha) and
the group of textual traditions associated with it play a critical
role in the historical
development of tantric Buddhism and literature in India, Tibet, China,
and Japan. The
Compendium of Principles marks the emergence of mature Indian Buddhist
tantra at the
end of the seventh century, and immediately spawned a body of literary
progeny that,
over time, was consolidated into traditions known in some Indian
circles as Yoga Tantra.
These traditions represent one of the most widely disseminated
Buddhist systems,
exerting significant influence not only in the aforementioned regions
but also in .r.
Lanka; southeast Asia; central Asian centers of Buddhist activity such
as Khotan;
Mongolia; and Sumatra. [...]"

(continua, 348 pagine)

link http://surajamrita.com/yoga/hidden/disser/Yoga-Tantra.pdf