First proposed by MacDonald, George (1922). "The Hellenistic Kingdoms of Syria, Bactira, and Parthia". In Rapson, E. J. (ed.). The Cambridge History of India: Volume I. Cambridge: Cambridge University Press. p. 393.. Holt 1999, p. 51 expresses great scepticism. Holt, Frank L. (1999). Thundering Zeus: The Making of Hellenistic Bactria. Berkeley, CA: University of California Press. ISBN0520211405.