Van der Goot, Annemieke Catharina, et al. “Profiling patterns of fecal 20-oxopregnane concentrations during ovarian cycles in free-ranging southern white rhinoceros (Ceratotherium simum simum).” Animal reproduction science 161 (2015): 89-95.

Van der Goot, Annemieke Catharina, et al. “Profiling patterns of fecal 20-oxopregnane concentrations during ovarian cycles in free-ranging southern white rhinoceros (Ceratotherium simum simum).” Animal reproduction science 161 (2015): 89-95.