In 1975 "The Yellow Book", also known as "The Oral Transmission of the Intelligent Father", was published, enumerates a series of stories that Zimey Rinpoche had heard informally from Trijang Rinpoche about ‘the many Ge-luk lamas whose lives are supposed to have been shortened by Shuk-den’s displeasure at their practicing Nying-ma teachings’. The text asserts the pre-eminence of the Gelug school which is symbolised and safeguarded by Dorje Shugden, and presents a stern warning to those within the Gelug whose eclectic tendencies would compromise its purity. This publication provoked angry reactions from members of non-Gelug traditions, setting in motion a bitter literary exchange that drew on ‘all aspects of sectarian rivalry’.