http://ri.uaemex.mx/bitstream/handle/20.500.11799/139905/Articulo%20Evaluaci%C3%B3n%20del%20impacto%20nutricional%2c%20ambiental%20y%20econ%C3%B3mico%20de%20los%20desperdicios%20org%C3%A1nicos%20del%20tianguis%20de%20Ozumba.pdf?sequence=1&isAllowed=y