543,712 STJERNBERG NILS Chronic bronchitis and bronchial asthma in an industrial community in Northern Sweden : relation to environmental and occupational exposure to SO2 : [âkademisk avhandling] / by Nils Stjernberg ; University of Umea. - Umea : Universitet, [1985]. — 116 s. : wykr. ; 22 cm + wkl. /2/ s. (Umea University Medical Dissertations, ISSN 0346—6612 ; new ser. nr 137)