@ARTICLE{Carrabs2018525,
author={Carrabs, F. and Cerulli, R. and Pentangelo, R. and Raiconi, A.},
title={A two-level metaheuristic for the all colors shortest path problem},
journal={Computational Optimization and Applications},
year={2018},
volume={71},
number={2},
pages={525-551},
}