Editorial for Volume 11 Number 2: Electric School Bus Routing Problem for Smart Cities. - Ocotlán Díaz-Parra; Jorge A. Ruiz-Vanoye; Alejandro Fuentes-Penna; Alberto Ochoa-Zezzatti; Ernesto Cruz-Hernández; Salma Estrada-García; Antonio Alvarado-Pérez (Int. J. Comb. Optim. Probl. Informatics, 2020)