Não informado. (1972). Hokkaido Mathematical Journal. Hokkaido University, Department of Mathematics.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Hokkaido Mathematical Journal. Sapporo, Japão: Hokkaido University, Department of Mathematics, 1972.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Hokkaido Mathematical Journal. Hokkaido University, Department of Mathematics, 1972.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.