Hammer, Paul Edward Johnston2006-11-252006-11-252004Oxford Dictionary of National Biography in association with the British Academy : from the earliest times to the year 2000 / H.C.G. Matthew and Brian Harrison (eds.), vol.15, pp. 945-960019861411X01986136521747-1001http://hdl.handle.net/2440/15716© Oxford University Press 2004–8enBook chapter002004242710.1093/ref:odnb/7565