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Chávez, D., M. Maquivar, C. S. Galina, J. Galindo, R. Molina, R. Molina-Montero, och Sandra Estrada. Evaluation of Early Embrionic Development After Natural Mating Using Ultrasonography in Bos Indicus Cows in the Humid Tropics of Costa Rica. 2008.

Chávez, D., et al. Evaluation of Early Embrionic Development After Natural Mating Using Ultrasonography in Bos Indicus Cows in the Humid Tropics of Costa Rica. 2008.