The expression theg bsdus skor gsum (“Mahāyānasaṃgraha Trilogy”) occurs in some Tibetan sources. See, for example, the dKa’ gdams gsung ’bum dkar chag 2 (pp. 80.5, 106.6). The question is which three works are included in it. No explanation can be found but the three works that come into question must be the (a) Mahāyānasaṃgraha (P5549; D4048) ascribed to Asaṅga, (b) Mahāyānasaṃgrahabhāṣya (P5551; D4050) ascribed to Vasubandhu, and (c) Mahāyānasaṃgrahopanibandhana (P5552; D4051) ascribed to *Asavabhāva.