Klancnik, S.; Hrelja, M.; Balic, J.; Brezocnik, M. (2016). Multi-objective optimization of the turning process using a Gravitational Search Algorithm (GSA) and NSGA-II approach, Advances in Production Engineering & Management, Vol. 11, No. 4, 366-376, http://dx.doi.org/10.14743/apem2016.4.234