@article{CRMATH_2005__341_1_1_0,
     author = {El Sahili, Amine},
     title = {Functional graphs},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {1--4},
     publisher = {Elsevier},
     volume = {341},
     number = {1},
     year = {2005},
     doi = {10.1016/j.crma.2005.05.021},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2005.05.021/}
}