"Komusō and 'Shakuhachi-Zen'" by Max Deeg

Author: Max Deeg
The full title is: Komusō and 'Shakuhachi-Zen': From Historical Legitimation to the Spiritualisation of a Buddhist denomination in the Edo Period
Publisher: Japanese Religions, Vol. 32 (1 & 2): 7-38

See the full article here:
http://www.japanese-religions.jp/publications/assets/JR32_a_Deeg.pdf

This is a very good article worth reading if you haven't already read it!