Flórez, José, Álvaro Torralba Arias de Reyna, Javier García, Carlos Linares López, Ángel García-Olaya, and Daniel Borrajo. 2011. “Planning Multi-Modal Transportation Problems”. Proceedings of the International Conference on Automated Planning and Scheduling 21 (1):66-73. https://doi.org/10.1609/icaps.v21i1.13466.