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On odd solutions of the equation X²-DY²=4
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Partial sums of sequences
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Explicit examples of unimodular lattices with the trivial automorphism group
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Congruence properties of Apery numbers
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 Mathematics Seminar Notes, 9(1981), pp. 259-267.

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Translation

Niji-Keishiki To Chokkou-Gun (M. Eichler : Quadratische Formen und orthogonale Gruppen.)
 Springer-Tokyo, 1992, 280p (reprint 2005, 268p.)
(co-translated with T. Hiramatsu)