@article{CRMATH_2005__340_11_787_0,
     author = {Bourgain, Jean and Brezis, Ha{\"\i}m and Nguyen, Hoai-Minh},
     title = {A new estimate for the topological degree},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {787--791},
     publisher = {Elsevier},
     volume = {340},
     number = {11},
     year = {2005},
     doi = {10.1016/j.crma.2005.04.007},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/j.crma.2005.04.007/}
}