@article{AIF_1994__44_4_1219_0,
     author = {Calvo-Andrade, Omegar and Soares, Marcio G.},
     title = {Chern numbers of a {Kupka} component},
     journal = {Annales de l'Institut Fourier},
     pages = {1219--1236},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {44},
     number = {4},
     year = {1994},
     doi = {10.5802/aif.1431},
     mrnumber = {95m:32045},
     zbl = {0811.32024},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/aif.1431/}
}