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Authors

Петраков И. С.

3 pieces.

14 days in Bucharest1970 · 4InformationПетраков И. С.
XII International Mathematical Olympiad for Schoolchildren1971 · 2InformationПетраков И. С.
XIII International Mathematical Olympiad for Schoolchildren1971 · 12InformationПетраков И. С., Скворцов В. А.