Maeda, Kazuo, Tomio Iwabe, Souichi Yoshida, et al. "Detailed multigrade evaluation of fetal disorders with the quantified actocardiogram" Journal of Perinatal Medicine, 37.4 (2009): 392-396. Retrieved 20 May. 2013, from doi:10.1515/JPM.2009.056

Maeda, K., Iwabe, T., Yoshida, S., et al. (2009). Detailed multigrade evaluation of fetal disorders with the quantified actocardiogram. Journal of Perinatal Medicine, 37(4), pp. 313-427. Retrieved 20 May. 2013, from doi:10.1515/JPM.2009.056

Maeda, Kazuo, Tomio Iwabe, Souichi Yoshida, et al. 2009. Detailed multigrade evaluation of fetal disorders with the quantified actocardiogram. Journal of Perinatal Medicine. 37(4): 313-427. Retrieved 20 May. 2013, from doi:10.1515/JPM.2009.056