Mansano, R. Z.; Beall, M. H.; Ross, M. G. (2007). "Fetal ST segment heart rate analysis in labor: Improvement of intervention criteria using interpolated base deficit". Journal of Maternal-Fetal and Neonatal Medicine. Quyển 20 số 1. tr. 47–52. doi:10.1080/14767050601055279. PMID17437199.
Mansano, R. Z.; Beall, M. H.; Ross, M. G. (2007). "Fetal ST segment heart rate analysis in labor: Improvement of intervention criteria using interpolated base deficit". Journal of Maternal-Fetal and Neonatal Medicine. Quyển 20 số 1. tr. 47–52. doi:10.1080/14767050601055279. PMID17437199.