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12
Proceedings of the Ninth International Colloquium on Differ..
Plovdiv, Bulgaria, 18–23 August, 1998
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13
Inverse and Improperly Posed Problems in Differential Equat..
Proceedings of the Conference on Mathematical and Numerical...
Mathematical Research ; 1, Mathematische Forschung
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14
Forty-third annual report of the National Advisory Committe..
United States congressional serial set ; serial set no. 12096;Senate document / 85th Congress, 2nd session. Senate ; no. 73