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Kendall B, Amoss DC, Sun HH, et al. The noise-free fetal electrocardiogram recorded from the maternal abdomen. Am J Obstet Gynecol. 1967;97(8):1129-34doi: 10.1016/0002-9378(67)90477-2.
Kendall, B., Amoss, D. C., Sun, H. H., Hahn, A. W., & Farell, D. M. (1967). The noise-free fetal electrocardiogram recorded from the maternal abdomen. American journal of obstetrics and gynecology, 97(8), 1129-34. https://doi.org/10.1016/0002-9378(67)90477-2
Kendall, B, et al. "The noise-free fetal electrocardiogram recorded from the maternal abdomen." American journal of obstetrics and gynecology vol. 97,8 (1967): 1129-34. doi: https://doi.org/10.1016/0002-9378(67)90477-2
Kendall B, Amoss DC, Sun HH, Hahn AW, Farell DM. The noise-free fetal electrocardiogram recorded from the maternal abdomen. Am J Obstet Gynecol. 1967 Apr 15;97(8):1129-34. doi: 10.1016/0002-9378(67)90477-2. PMID: 6021295.
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