Early Tantric Vaiṣṇavism: Three Newly Discovered Works of the Pañcarātra, the Svāyambhuvapañcarātra, Devāmṛtapañcarātra and Aṣṭādaśavidhāna, Critically Edited from Their 11th and 12th Century Nepalese Palm Leaf Manuscripts. Edited with an