Vasubandhu's explication of this doctrine as well as the Lankanavatara are the some primary sources for the systematization of this doctrine. Later non-Indian Buddhist traditions such as the Huayan School also developed this doctrine through works such as Fa-Zhang's essay "On the Golden Lion." Developed theoretically during the Yogacara school, this doctrine's analysis of sva-bhava or "own-being" is explicitly rejected by
Vasubandhu's explication of this doctrine as well as the Lankanavatara are the some primary sources for the systematization of this doctrine. Later non-Indian Buddhist traditions such as the Huayan School also developed this doctrine through works such as Fa-Zhang's essay "On the Golden Lion." Developed theoretically during the Yogacara school, this doctrine's analysis of sva-bhava or "own-being" is explicitly rejected by Nagarjuna. One part of this doctrine relates to the "other-dependent" or "incomplete-awakening" of the bodhisattvas and relates to the "shared-reward" or "sambhoga" form of this doctrine, which allows them to be understood as a bridge in this doctrine. The first or "nirmana" form of this doctrine refers to the historical manifestation of the Buddha. FTP, name this doctrine which holds that the Buddha-nature can be understood has having three forms or bodies. 
Vasubandhu's explication of this doctrine as well as the Lankanavatara are the some primary sources for the systematization of this doctrine.
Trikaya [accept the Three Bodies or Buddha Bodies or other near-equivalents before "Buddha-nature" is read]