RETRACTED: Optimization of surface grinding operations using a differential evolution approach

This article has been retracted at the request of the Editors-in-Chief. Please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).Reason: it is virtually identical to one submitted one month earlier by the same author to the Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 221 (2007) 1185–1192.