Koetzing, Timo Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Koetzing, T., Sutton, A. M., Neumann, F., & O'Reilly, U.-M. (2014). The Max Problem Revisited: The Importance of Mutation in Genetic Programming. Theoretical Computer Science, 545, 94-107. doi:10.1016/j.tcs.2013.06.014.