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. . . , . . ., . , , . . ., , , , , . .

.: . . , . 1. , 1969 [. . 515542]; Tutte W. . Lectures on matroids. Journal of research National Bureau of Standards, 1965, v. 69B, J4 1-2: erge C. Graphes et hypergraphes. Paris, 1971s . . .

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