Cordial thanks to Martin Straube for sending me a soft copy of T. Oberlies' article "Neuer Wein in alten Schläuchen? Zur Geschichte der buddhistischen Ordensregeln." 
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PD Dr. Philipp A. Maas
Research Associate
Department of Indology and Central Asian Studies
University of Leipzig
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https://spp1448.academia.edu/PhilippMaas