| 2001 | - | Crossover in Grammatical Evolution: The Search Continues - O'Neill,Ryan,Keijzer,Cattolico | :: | 2 |
| 5. Keijzer M., Ryan C., O'Neill M., Cattolico M., Babovic V. 2001. Ripple Crossover in Genetic Programming. In Proceedings of EuroGP 2001.
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| 2000 | - | Crossover in Grammatical Evolution: A Smooth Operator? - O'Neill,Ryan | :: | 2 |
| 5. Keijzer M., Ryan C., O'Neill M., Cattolico M., Babovic V. 2001. Ripple Crossover in Genetic Programming. In Proceedings of EuroGP 2001.
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