Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
Yoshiaki Sofue and Rainer Beck,The Bisymmetric Spiral Magnetic Field in M31,Publications of the Astronomical Society of Japan,00046264,Tokyo : Astronomical Society of Japan,1987-09,39,4,p541-546,https://cir.nii.ac.jp/crid/1521136280704367488,