Chih-I (538–597). An Introduction to the Life and Ideas of a Chinese Buddhist Monk by Leon HurvitzHeinrich DumoulinMN 21:1/2 (1966) pp. 217–18 → jstor.org/stable/2383415ShareAbstraktion und Intuition als Wege zur Wahrheit in Yoga und Zen by Alfonso VerdúThe Three Pillars of Zen: Teaching, Practice, and Enlightenment by Philip Kapleau