1. An early work, not commented on by Śaṅkara, which explains the hymns addressed to Nārāyana.
2. A late work forming the tenth book of the Taittirīya Āraṇyaka. It celebrates Prājāpati and an extensive pantheon, including Durgā.
"Mahānārāyaṇīya Upaniṣad." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (August 17, 2018). http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/mahanarayaniya-upanisad
"Mahānārāyaṇīya Upaniṣad." The Concise Oxford Dictionary of World Religions. . Retrieved August 17, 2018 from Encyclopedia.com: http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/mahanarayaniya-upanisad