545,032 BYSTROM ANDERS Evaluation of endodontic treatment of teeth with apical periodontitis : [akademisk avhandling] / Anders Bystrom ; [Umea University]. — Umeá : University, 1986. _ 96 s. [wiele liczb.] — wkl. [2] s. : wykr. ; 25 cm (Umeä University Odontological Dissertations, ISSN 0345-7532 ; 27)