Roelof K. Brouwer Witold Pedrycz One-to-many mappings represented on feed-forward networks. 365-370 2001 conf/esann/2001 ESANN http://www.dice.ucl.ac.be/Proceedings/esann/esannpdf/es2001-43.pdf db/conf/esann/esann2001.html#BrouwerP01