In memoriam. Orlando Zelaya-Angel’s contributions in Superficies y Vacío. Superficies y Vacio [Internet]. 2021 Nov. 23 [cited 2025 Apr. 8];34:211123. Available from: https://superficiesyvacio.smctsm.org.mx/index.php/SyV/article/view/2021_syv34_2-211123