On the dominator chromatic number of the generalized caterpillars forest Soumia Aioula, Mustapha Chellali and Noureddine Ikhlef-Eschouf RAIRO-Oper. Res., 55 (2021) S1647-S1655 Published online: 02 March 2021 DOI: 10.1051/ro/2020122