Valkova , L., Andreeva , P., Milachich , T., Bandreva , B., Penkova , P., Bochev , I., Petkova, B., Timeva , T. and Shterev , A. (2020) “Determination of Optimal Number of Vitrified Human Autologous or Donor Oocytes Needed for One Live Birth”, Problems of Cryobiology and Cryomedicine, 30(4), pp. 384–388. doi: 10.15407/cryo30.04.384.