548,311 RÄISÄNEN ILKKA B-endorphin in maternal and umbilical cord blood and in amniotic fluid during gestation, labor, and puerperium : academic dissertation / Illka Raisanen ; Departments I and II of Obstetrics and Gynecology, Helsinki University Central Hospital. - Helsinki : [Painovalssi Oy], 1990. - .58, [34 wiele liczb.] s. : wykr. ; 25 cm summ. ISBN 952-90-1710-3