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Partially supported by Grant-in-Aid for Scientific Research #05640063
Partially supported by Grant-in-Aid for Scientific Research #05640067
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Sekiguchi, T., Suwa, N. A note on extensions of algebraic and formal groups II. Math Z 217, 447–457 (1994). https://doi.org/10.1007/BF02571954
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DOI: https://doi.org/10.1007/BF02571954