Yes indeed, click the blue 'wiki' word in the quote. Ultimately, it looks like it terminates with the following reference:
King, Richard; Ācārya, Gauḍapāda (1995), Early Advaita Vedānta and Buddhism: the Mahāyāna context of the Gauḍapādīya-kārikā, SUNY Press, ISBN 978-0-7914-2513-8
I think Gombrich discussed this in similar terms in How Buddhism Began, somewhere, but maybe he used the same source...
There may be more detail, and more references, at .