Hrelja, M.; Klancnik, S.;  Irgolic, T.; Paulic, M.; Jurkovic, Z.; Balic, J.; Brezocnik, M. (2014). Particle swarm optimization approach for modelling a turning process, Advances in Production Engineering & Management, Vol. 9, No. 1, 21-30, http://dx.doi.org/10.14743/apem2014.1.173.