@article{CMH_1972__47_139497,
     author = {F. Ronga},
     title = {Le calcul des classes duales aux singularit\'es de {Boardman} d'ordre deux},
     journal = {Commentarii mathematici Helvetici},
     pages = {15--35},
     publisher = {mathdoc},
     volume = {47},
     year = {1972},
     zbl = {0236.58003},
     url = {http://geodesic.mathdoc.fr/item/CMH_1972__47_139497/}
}