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	1.	[External fetal electrocardiography, indications and future prospectives]. [electronic resource] by de Smoler, P E Karchmer, S Producer: 19760706 In: Ginecologia y obstetricia de Mexico vol. 38 Availability: No items available. Save to lists Add to cart (remove)
	2.	Correlation of fetal heart rate, maternal heart rate, and age of pregnancy. [electronic resource] by de Smoler, P E Smith, H C Karchmer, S Producer: 19750510 In: American journal of obstetrics and gynecology vol. 121 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	3.	[External fetal electrocardiography. Importance of preparation of the mother's skin and other sources of errors]. [electronic resource] by de Smoler, P E Smith, H C Sanchez, A G Karchmer, S Producer: 19760802 In: Journal de gynecologie, obstetrique et biologie de la reproduction vol. 2 Availability: No items available. Save to lists Add to cart (remove)
	4.	[Electrocardiography, stress and the third pregnancy trimester]. [electronic resource] by Domínguez, C G De Smoler, P E Armas Domínguez, J Karchmer, S Skromne, D Producer: 19760901 In: Archivos del Instituto de Cardiologia de Mexico vol. 46 Availability: No items available. Save to lists Add to cart (remove)

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