A tree-structured covalent-bond-driven molecular memetic algorithm for optimization of ring-deficient molecules. - Mostafa Mostafa Hashim Ellabaan; Stephanus Daniel Handoko; Yew-Soon Ong; Chee Keong Kwoh 001; S. A. Bahnassy; F. M. Elassawy; H. Y. Man (Comput. Math. Appl., 2012)