López, Pavel David Ulises Avendaño, et al. “Diagnosis of Arithmetic-Algebraic Lag in Rural High School Students: Impact of the COVID-19 Pandemic on Fundamental Mathematical Competencies at CETIS 167, Milpa Alta”. Edelweiss Applied Science and Technology, vol. 9, no. 10, Oct. 2025, pp. 815-31, doi:10.55214/2576-8484.v9i10.10554.