P. A. Graniel Velasco and J. M. Angulo Castellanos, “Otto Wolter Hayer: médico, agricultor y constructor”, CZ, vol. 12, no. 26, pp. 12–19, Feb. 2021, Accessed: Oct. 29, 2025. [Online]. Available: https://revistacinzontle.ujat.mx/Cinzontle/article/view/3985