Peña, Joseph E; Ufberg, David; Cooney, Nancy; Denis, André L (2000). "Usefulness of Doppler sonography in the diagnosis of ovarian torsion". Fertility and Sterility. 73 (5): 1047–50. doi:10.1016/S0015-0282(00)00487-8. PMID10785237.
Peña, Joseph E; Ufberg, David; Cooney, Nancy; Denis, André L (2000). "Usefulness of Doppler sonography in the diagnosis of ovarian torsion". Fertility and Sterility. 73 (5): 1047–50. doi:10.1016/S0015-0282(00)00487-8. PMID10785237.