The main source for the yogic and meditative practices of the Yogācāra school is the encyclopedic "Yogācārabhūmi-Śāstra ("YBh", Treatise on the Foundation for Yoga Practitioners)." The YBh presents a structured exposition of the Mahāyāna Buddhist path of "yoga" (here referring to spiritual practice in general) from a Yogācāra perspective and relies in both Āgama/Nikāya texts and Mahāyāna sūtras while also being influenced by Vaibhāṣika Abhidharma. According to some scholars, this text can be traced to communities of "Yogācāras," which initially referred not to a philosophical school, but to groups of meditation specialists whose main focus was Buddhist yoga. Other Yogācāra texts which also discuss meditation and spiritual practice (and show some relationship with the YBh) include the "Saṃdhinirmocanasūtra," the "Madhyāntavibhāga", "Mahāyānasūtrālaṃkāra, Dharmadharmatāvibhāga" and Asanga's "Mahāyānasaṃgraha".