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3
Proceedings of the Ninth International Colloquium on Differ..
Plovdiv, Bulgaria, 18–23 August, 1998
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4
Proceedings of the Third International Colloquium on Numeri..
Plovdiv, Bulgaria, 13–17 August, 1994
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5
Proceedings of the Sixth International Colloguium on Differ..
Plovdiv, Bulgaria, 18–23 August, 1995
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6
Proceedings of the Second International Colloquium on Numer..
Plovdiv, Bulgaria, 13–17 August 1993
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7
Proceedings of the First International Colloquium on Numeri..
Plovdiv, Bulgaria, 13–17 August 1992
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9
Proceedings of the seventh International Colloquium on Diff..
Plovdiv, Bulgaria, 18–23 August, 1996
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11
Proceedings of the Fifth International Colloquium on Differ..
Plovdiv, Bulgaria, 18–23 August, 1994