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CANADIAN MATHEMATICAL BULLETIN-BULLETIN CANADIEN DE MATHEMATIQUES, vol. 42, no. 3, page. 263 - 273, 1999-09

JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, vol. 232, no. 1, page. 34 - 44, 1999-04-01

APPLIED MATHEMATICS LETTERS, vol. 11, no. 5, page. 29 - 34, 1998-09

JOURNAL OF NUMBER THEORY, vol. 68, no. 2, page. 160 - 177, 1998-02

ILLINOIS JOURNAL OF MATHEMATICS, vol. 42, no. 2, page. 179 - 186, 1998-01

JOURNAL OF THE AUSTRALIAN MATHEMATICAL SOCIETY SERIES A-PURE MATHEMATICS AND STATISTICS, vol. 63, page. 390 - 395, 1997-12

MANUSCRIPTA MATHEMATICA, vol. 93, no. 2, page. 177 - 187, 1997-06

MATHEMATISCHE ZEITSCHRIFT, vol. 225, no. 1, page. 95 - 101, 1997-05

ABHANDLUNGEN AUS DEM MATHEMATISCHEN SEMINAR DER UNIVERSITAT HAMBURG, vol. 67, page. 307 - 314, 1997-01

PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 123, no. 9, page. 2625 - 2628, 1995-09

MATHEMATISCHE ZEITSCHRIFT, vol. 219, no. 1, page. 71 - 76, 1995-05

RESULTS IN MATHEMATICS, vol. 25, page. 40 - 49, 1994-06

CISC'94, vol. 11, page. 10, 1994-06

COMMUNICATIONS IN CONTEMPORARY MATHEMATICS, vol. 143, page. 89 - 108, 1993-06

JOURNAL OF NUMBER THEORY, vol. 42, no. 2, page. 158 - 188, 1992-10

PHYSICA D, vol. 55, no. 1-2, page. 113 - 120, 1992-02

RESULTS IN MATHEMATICS, vol. 17, page. 57 - 77, 1990-10

MATHEMATISCHE ANNALEN, vol. 286, no. 4, page. 697 - 707, 1990-06