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Mathematical Notes > 2005 > 77 > 1-2 > 263-272
Mathematical Notes > 2005 > 77 > 1 > 263-272
Mathematical Notes > 2004 > 75 > 1-2 > 131-139
Mathematical Notes > 2005 > 77 > 1-2 > 263-272
Mathematical Notes > 2005 > 77 > 1 > 263-272
Mathematical Notes > 2004 > 75 > 1-2 > 131-139