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- [4] NECESSARY CONDITIONS FOR SETS OF UNIQUENESS OF WALSH-SERIES WITH GAPS MATHEMATICS OF THE USSR-SBORNIK, 1987, 133 (3-4): : 461 - 470
- [5] ON CERTAIN CLASSES OF SETS OF UNIQUENESS OF MULTIPLE WALSH-SERIES MATHEMATICS OF THE USSR-SBORNIK, 1990, 67 (02): : 393 - 401