[1]
Calamari, C.V. et al. 2003. Evaluation of two methods for early pregnancy diagnosis in ewes: transrectal ultrasonography and pregnancy detector for small ruminant (DPPR-80®). Brazilian Journal of Veterinary Research and Animal Science. 40, 4 (Jan. 2003), 261–266. DOI:https://doi.org/10.1590/S1413-95962003000400004.