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Sterzik, K., Rosenbusch, B., Grab, D. et al. Pregnancies following direct oocyte-sperm transfer (DOST): A simple alternative to conventional in vitro fertilization (IVF). J Assist Reprod Genet 8, 241–242 (1991). https://doi.org/10.1007/BF01130815
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DOI: https://doi.org/10.1007/BF01130815