Node-depth phylogenetic-based encoding, a spanning-tree representation for evolutionary algorithms: Part I: proposal and properties analysis - Lima, Telma Woerle de; Delbem, Alexandre Cláudio Botazzo; Soares, Anderson da Silva; Federson, Fernando Marques; London Junior, João Bosco Augusto; Baalen, Jeffrey Van (Swarm and Evolutionary Computation, 2016)