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C. R. Math. Rep. Acad. Sci. Canada Vol. 22 (1) 2000, pp. 25–27
M.A. Dokuchaev / S.O. Juriaans / C.P. Milies / M.L. Sobral Singer (Received: 1999/05/03)

Mathematical Reports - Comptes rendus mathématiques
of the Academy of Science | de l'Académie des sciences