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- [7] AMBIENT ISOTOPY CLASSES IN GRAPH COMPLEMENTS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1975, 22 (03): : A425 - A425
- [10] Characteristic classes and Ehresmann connections for Legendrian foliations PUBLICATIONES MATHEMATICAE-DEBRECEN, 2007, 70 (3-4): : 395 - 425