Martínez-Barbabosa, I., Gutiérrez-Cárdenas, E.M., Aguilar Venegas, J., Pimienta Lastra, R. de J. and Shea, M. 2011. Frequency of geohelminths in pet dogs from seven municipalities of Mexico City. Veterinaria México OA. 42, 1 (Jun. 2011).