books.google.co.in - The volume traces the intellectual history of Patanjala Yoga philosophy from the early centuries of the Common Era through the twentieth century. It also provides a systematic discussions of the philosophy of classical Yoga. Particular attention is given to the meaning of concentration (Samadhi), engrossment...http://books.google.co.in/books/about/Encyclopedia_of_Indian_Philosophies.html?id=p6pURGdBBmIC&utm_source=gb-gplus-shareEncyclopedia of Indian Philosophies