Não informado. (1972). Hokkaido Mathematical Journal. Hokkaido University, Department of Mathematics.
Chicago-viite (17. p.)Não informado. Hokkaido Mathematical Journal. Sapporo, Japão: Hokkaido University, Department of Mathematics, 1972.
MLA-viite (8. p.)Não informado. Hokkaido Mathematical Journal. Hokkaido University, Department of Mathematics, 1972.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.