Nilpotent completions and Lie rings associated to link groups. Sadayoshi Kojima — 1983 Commentarii mathematici Helvetici
Erratum to "Classification of simple knots by Levine pairings". Sadayoshi Kojima — 1980 Commentarii mathematici Helvetici
Classification of simple knots by Levine pairings. Sadayoshi Kojima — 1979 Commentarii mathematici Helvetici
Algebraic Classification of Linking Pairings on 3-Manifolds. Akio Kawauchi; Sadayoshi Kojima — 1980 Mathematische Annalen