  P. Hansen and N. Mladenović. An introduction to variable neighbourhood search. In S Voss, S. Martello, I.H. Osman, and C. Roucairol, editors, Metaheuristics: Advances and trends in local search procedures for optimization , pages 000-000. Kluwer Academic Publishers, Boston, 0000.  P. Hansen and N. Mladenović. Developments of variable neighborhood search. In C.C. Ribeiro and P. Hansen, editors, Essays and surveys in metaheuristics , pages 000-000. Kluwer Academic Publishers, Boston, 0000.  P. Hansen and N. Mladenović. Variable neighborhood search. In F. Glover and G. Kochenberger, editors, Handbook of metaheuristics , pages 000-000. Kluwer Academic Publishers, Boston, 0000.  J.P. Hart and A.W. Shogan. Semi-greedy heuristics: An empirical study. Operations Research Letters