Jerónimo Arenas-García Aníbal R. Figueiras-Vidal Amanda J. C. Sharkey The Beneficial Effects of Using Multi-net Systems That Focus on Hard Patterns. 45-54 2003 conf/mcs/2003 Multiple Classifier Systems http://link.springer.de/link/service/series/0558/bibs/2709/27090045.htm db/conf/mcs/mcs2003.html#Arenas-GarciaFS03