@article{AIF_1981__31_3_115_0,
     author = {Yger, Alain},
     title = {Fonctions d\'efinies dans le plan et v\'erifiant certaines propri\'et\'es de moyenne},
     journal = {Annales de l'Institut Fourier},
     pages = {115--146},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {31},
     number = {3},
     year = {1981},
     doi = {10.5802/aif.841},
     mrnumber = {84e:39005},
     zbl = {0438.43010},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.5802/aif.841/}
}