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Nulsen, J.C., Metzger, D.A. & Steinhoff, M.M. Sperm electron microscopy for the evaluation of in vitro fertilization failures. J Assist Reprod Genet 9, 491–497 (1992). https://doi.org/10.1007/BF01204058
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DOI: https://doi.org/10.1007/BF01204058