References
Vatev I: High fertilization rate in a procedure for in vitro fertilization of human oocytes upon using a chemically defined medium. CR Acad Bulg Sci 1987;40:101–104
Vatev I: Human in vitro fertilization and embryo transfer program at the Medical Academy, Sofia, Bulgaria. J Vitro Fert Embryo Transfer 1988;5:48–49
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Vatev, I., Fitchev, P., Tabakova, P. et al. The in vitro fertilization and embryo transfer program at the first Women's Hospital “T. Kirkova,” Sofia, Bulgaria. J Assist Reprod Genet 7, 119 (1990). https://doi.org/10.1007/BF01135586
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DOI: https://doi.org/10.1007/BF01135586