Tunçer M, Demirsoy S, Özsoylu Ş, Erdem G. The significance of zinc, copper and magnesium levels of maternal, cord and newborns’ sera in hyperbilirubinemia of unknown etiology. Turk J Pediatr. 1982;24(4):227-233. doi:10.24953/turkjpediatr.1982.4113