M. de Queiroz, P. Campos, R. de Barros, and J. Brancher.
" Vehicle routing problem with service windows, heterogeneous fleets and fractional deliveries", in <em>Proceedings of the 8th Brazilian Symposium on Information Systems</em>, São Paulo, 2012, pp. 411-422, doi: <a href="https://doi.org/10.5753/sbsi.2012.14424">https://doi.org/10.5753/sbsi.2012.14424</a>.