This new Vaibhāṣika orthodoxy, however, was not readily accepted by all Sarvāstivādins. Some "Western masters" from Gandhara and Bactria had divergent views which disagreed with the new Kashmiri orthodoxy. These disagreements can be seen in post-"Mahāvibhaṣa" works, such as the *"Tattvasiddhi-Śāstra" (成實論), the *"Abhidharmahṛday"a (T no. 1550) and its commentaries (T no. 1551, no. 1552), the "Abhidharmakośakārikā" of Vasubandhu and its commentaries (who critiqued some orthodox views), and the *"Nyāyānusāra" (Ny) of master Saṃghabhadra (ca fifth century CE) who formulated the most robust Vaibhāṣika response to the new criticisms.