A resectorization of fire brigades in the north of Portugal - Lima, M. M.; Sousa, F.; Öztürk, E. G.; Rocha, P. F.; Rodrigues, A. M.; Ferreira, J. S.; Nunes, A. C.; Lopes, I. C.; Oliveira, C. T. (Operational Research. Springer Proceedings in Mathematics & Statistics, 2023)