The combinatorial formula of Gabrielov, Gelfand and Losik for the first Pontrjagin class
Séminaire Bourbaki : vol. 1976/77, exposés 489-506, Séminaire Bourbaki, no. 19 (1978), Talk no. 497, p. 105-124 
@incollection{SB_1976-1977__19__105_0,
     author = {MacPherson, Robert},
     title = {The combinatorial formula of Gabrielov, Gelfand and Losik for the first Pontrjagin class},
     booktitle = {S\'eminaire Bourbaki : vol. 1976/77, expos\'es 489-506},
     author = {Collectif},
     series = {S\'eminaire Bourbaki},
     publisher = {Springer-Verlag},
     number = {19},
     year = {1978},
     note = {talk:497},
     pages = {105-124},
     zbl = {0388.57013},
     mrnumber = {521763},
     language = {en},
     url = {http://www.numdam.org/item/SB_1976-1977__19__105_0}
}

MacPherson, Robert. The combinatorial formula of Gabrielov, Gelfand and Losik for the first Pontrjagin class, in Séminaire Bourbaki : vol. 1976/77, exposés 489-506, Séminaire Bourbaki, no. 19 (1978), Talk no. 497, pp. 105-124. http://www.numdam.org/item/SB_1976-1977__19__105_0/

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