E. G. Ozturk et al.,  "Developing a system for sectorization: An overview", in Operational Research. Springer Proc. in Mathematics & Statistics , Almeida, J. P., Geraldes, C. S., Lopes, I. C., Moniz, S., Oliveira, J. F., and Pinto, A. A., Ed., Figueira da Foz, Portugal, Springer, 2023, vol. 411, pp. 129-141