N. DI MAURO, T.M.A. BASILE, S. FERILLI, AND F. ESPOSITO

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taking fixed the neighbourhood operator to SPLIT/MERGE. The best values are obtained with a walk probability equal to 0.6 or to 0.7. There is an increasing improvement for values ranging from 0.2 to 0.6/0.7; then the quality of the found solutions starts to decrease for values ranging from 0.7 to 0.95.

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