2010
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C. R. Math. Acad. Sci. Paris. 2010;348:1001–1004. doi:10.1016/j.crma.2010.07.032. .
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Proc. Japan Acad. Ser. A Math. Sci. 2010;86:133–138. doi:10.3792/pjaa.86.133. .
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Journal of Algebra. 2010;324:1259 - 1278. doi:http://dx.doi.org/10.1016/j.jalgebra.2010.04.020. .
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Math. Proc. Cambridge Philos. Soc. 2010;148:267–288. doi:10.1017/S0305004109990405. .
2009
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. 2009;Proceedings of $4^{th}$ International Conference on Research and Education in Mathematics:524-531.
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C. R. Math. Acad. Sci. Paris. 2009;347:1415–1418. doi:10.1016/j.crma.2009.10.018. .
2008
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Proc. Japan Acad. Ser. A Math. Sci. 2008;84:101–106. doi:10.3792/pjaa.84.101. .
2005
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Illinois Journal of Mathematics . 2005;49(2):431-444. Available at: http://projecteuclid.org/euclid.ijm/1258138026. .
1990
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Japanese journal of mathematics. New series. 1990;143. .
1987
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Japanese journal of mathematics. New series. 1987;13:169-208. doi:10.4099/math1924.13.169. .
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