Guzmán Barrón, A., Payva Carbajal, C., & Díaz García, J. (1971). Nutritional assessment of the area of influence of the marginal road. Biochemical studies, hemoglobin determinations, inorganic phosphorus and carotene. Anales De La Facultad De Medicina, 54(1), 17-44. https://doi.org/10.15381/anales.v54i1.5001