David von Oheimb Tobias Nipkow Hoare Logic for NanoJava: Auxiliary Variables, Side Effects, and Virtual Methods Revisited. 89-105 2002 conf/fm/2002 FME http://link.springer.de/link/service/series/0558/bibs/2391/23910089.htm db/conf/fm/fme2002.html#OheimbN02