Amir Hossein Gandomi Xin-She Yang Siamak Talatahari Suash Deb Coupled eagle strategy and differential evolution for unconstrained and constrained global optimization. 191-200 2012 63 Computers & Mathematics with Applications 1 http://dx.doi.org/10.1016/j.camwa.2011.11.010 db/journals/cma/cma63.html#GandomiYTD12