Semantically driven crossover in genetic programming. - Lawrence Beadle; Colin G. Johnson (IEEE Congress on Evolutionary Computation, 2008)

Semantically driven mutation in genetic programming. - Lawrence Beadle; Colin G. Johnson (IEEE Congress on Evolutionary Computation, 2009)

Semantic analysis of program initialisation in genetic programming. - Lawrence Beadle; Colin G. Johnson (Genet. Program. Evolvable Mach., 2009)

Semantic and structural analysis of genetic programming. - Lawrence Beadle (2009)