Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Makoto Ishida,Class numbers of algebraic number fields of Eisenstein type,Journal of Number Theory,0022-314X,Elsevier BV,1970-11-01,2,,404-413,https://cir.nii.ac.jp/crid/1872835442689379328,https://doi.org/10.1016/0022-314x(70)90043-0