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  1973. Dr R.SCHWARCZ, R.CALDEYRO-BARCIA et al : Fetal heart rate patterns in labors with intact and with ruptured membranes.
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  1972. Dr L.MANN et al : The effect of head compression on FHR, brain metabolism and function.
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  1972. Dr R.CALDEYRO-BARCIA, R-L.SCHWARCZ, O.ALTHABE et al : Effects of rupture of membrane on fetal heart rate pattern.
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  1970. Dr P.MOCSARY et al : Relationship between fetal intracranial pressure and fetal heart rate during labor.
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  1968. Dr R.CALDEYRO-BARCIA, O.ALTHABE, G.ARAMBURU : Obstetrical factors influencing intrapartum compression of the fetal head and the incidence of Dips 1 in fetal heart rate.
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  1967. Dr C.MENDEZ BAUER, R.CALDEYRO BARCIA et al : Relationship between blood pH and heart rate in the human fetus during labor.
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  1964. Dr W-M.PAUL, E-J.QUILLIGAN, T.MACLACHLAN : Cardiovascular phenomenon associated with fetal head compression.
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  1963. Dr C.MENDEZ-BAUER, R.CALDEYRO-BARCIA et al : Effects of atropine on the heart rate of the human fetus during labor.
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  1933. Dr M-A.CASTILLO : A hypothetical explanation of the slowing of the fetal heart beat.