From Hindupedia, the Hindu Encyclopedia
By Swami Harshananda
Utpalācārya lived in A. D. 900. He is the author of one of the basic works of Kashmir Śaivism. It is called īśvara-pratyabhijñākārikā. He has tried to establish Śivādvaita philosophy by criticizing other schools. Siddhitrayi is another work of his.
- The Concise Encyclopedia of Hinduism, Swami Harshananda, Ram Krishna Math, Bangalore