Joao Sarubbi Geraldo Robson Mateus Henrique Pacca Loureiro Luna Gilberto de Miranda Jr. Model and algorithms for the Multicommodity Traveling Salesman Problem. 113-119 2007 HIS http://doi.ieeecomputersociety.org/10.1109/HIS.2007.57 conf/his/2007 db/conf/his/his2007.html#SarubbiMLM07