@article{CRMATH_2003__336_11_925_0,
     author = {Hajac, Piotr M. and Matthes, Rainer and Szyma\'nski, Wojciech},
     title = {Chern numbers for two families of noncommutative {Hopf} fibrations},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {925--930},
     publisher = {Elsevier},
     volume = {336},
     number = {11},
     year = {2003},
     doi = {10.1016/S1631-073X(03)00190-0},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/S1631-073X(03)00190-0/}
}