Distefano, S., G. Merlino, A. Puliafito, D. Cerotti, and R. Dautov,  "Crowdsourcing and stigmergic approaches for (swarm) intelligent transportation systems",  Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), vol. 10745, Heidelberg, Springer Verlag, 2018.