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Books about Rujing:
The Key to the Qigong Meditation State: Rujing and Still Qigong by Tianjun Liu (Dec 21, 2014)
Wiki information Rujing:
Tiāntóng Rújìng was a Caodong Buddhist monk living in Qìngdé Temple on Tiāntóng Mountain in Yinzhou District, Ningbo. He taught and gave dharma transmission to Sōtō Zen founder Dōgen as well as early Sōtō monk Jakuen. His teacher was Xuedou Zhijian,...