DDS. Melanie Fernanda Ferrín Yépez , Scholar. Angélica Miranda Arce , Ángela Mercedes Murillo Almache 2025. Chronological Age and Nolla’s stages in first permanent molars in children: radiographic observation. Cuestiones de Fisioterapia. 54, 5 (Feb. 2025), 319–323. DOI:https://doi.org/10.48047/gm66nz84.