ULFBERG JAN 553,647 Sleep disordered breathing at work : cause and effects / by Jan Ulfberg ; [Uppsala University]. - Uppsala : Acta Universitatis Upsaliensis, 1999. - 76 s. ; 24 cm. - (Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 0282-7476 , 825) Doctoral dissertation. - Bibliogr. s. 62-76 ISBN 91-554-4415-6