Santos, R. L., Marques Jr., A. de P., & Barreto, J. B. (1997). Morphometric analysis of collagen in placentomes of dairy cows with normal delivery and with placental retention. Brazilian Journal of Veterinary Research and Animal Science, 34(4), 240-242. https://doi.org/10.11606/issn.2318-3659.v34i4p240-242