"The mention of 'Nambanus' whom the scholars have identified as Nahapana in the Periplus of the Erythrean Sea would help us to solve the problem of Nahapana's time.", in "History of the Andhras"Archived 13 March 2007 at the Wayback Machine
An Inscribed Silver Buddhist Reliquary of the Time of King Kharaosta and Prince Indravarman, Richard Salomon, Journal of the American Oriental Society, Vol. 116, No. 3 (Jul. - Sep., 1996), pp. 442 [1]
A Kharosthī Reliquary Inscription of the Time of the Apraca Prince Visnuvarma, by Richard Salomon, South Asian Studies 11 1995, Pages 27-32, Published online: 09 Aug 2010 [2]
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"The mention of 'Nambanus' whom the scholars have identified as Nahapana in the Periplus of the Erythrean Sea would help us to solve the problem of Nahapana's time.", in "History of the Andhras"Archived 13 March 2007 at the Wayback Machine