@article{CRMATH_2004__338_3_187_0,
     author = {Roland Bacher},
     title = {Le cocycle du verger},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {187--190},
     publisher = {Elsevier},
     volume = {338},
     number = {3},
     year = {2004},
     doi = {10.1016/j.crma.2003.11.021},
     language = {fr},
}