Liara Aparecida dos Santos Leal Paulo Blauth Menezes Dalcidio Moraes Claudio Laira Vieira Toscani Optimization Problems Categories. 285-299 http://link.springer.de/link/service/series/0558/bibs/2178/21780285.htm 2001 conf/eurocast/2001 EUROCAST db/conf/eurocast/eurocast2001.html#LealMCT01