Não informado. (1972). Hokkaido Mathematical Journal. Hokkaido University, Department of Mathematics.
Chicago-referens (17:e uppl.)Não informado. Hokkaido Mathematical Journal. Sapporo, Japão: Hokkaido University, Department of Mathematics, 1972.
MLA-referens (8:e uppl.)Não informado. Hokkaido Mathematical Journal. Hokkaido University, Department of Mathematics, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.