Meditation is Action Taken: On Zhang Rinpoche, a Meditation-based Activist in Twelfth-century Tibet. Lungta [an annual publication of the Amnye Machen Institute, McLeod Ganj, India], vol. 14 (Spring 2001), pp. 45-56. This special issue of Lungta, edited by Roberto Vitali, is entitled “Aspects of Tibetan History.”
For a scan, click here. (Dropbox link put up in July 2013.)