301,241 NORDBERG LILLEMOR Psychomotor and mental development at four years of age : relation to psychosocial conditions and health : results from a prospective longitudinal study / Nordberg Lillemor. - Oslo [etc. ] : Scandinavian University Press, 1995. - [2], 46 s. : wykr. ; 28 cm (Acta Paediatrica, ISSN 0803-5326 , vol. 84, suppl. 409)