Alain Ratle Michèle Sebag A Novel Approach to Machine Discovery: Genetic Programming and Stochastic Grammars. 207-222 2002 conf/ilp/2002 ILP http://link.springer.de/link/service/series/0558/bibs/2583/25830207.htm db/conf/ilp/ilp2002.html#RatleS02