This article is a small and well deserved tribute to Professor Nelson Maculan Filho on occasion of his 60th anniversary, in recognition to his outstanding contributions to Brazilian universities. As friends, collaborators and former students, we are truly heartier and honored to be invited by Professor Jayme Luiz Szwarcfiter to write down this work. Carpe diem, dear friend Maculan!
Nelson Maculan; combinatorial optimization; integer programming; applied mathematics
