@article{IM_1975__29_142331,
     author = {A. Debiard and B. Gaveau},
     title = {Diff\'erentiabilit\'e des fonctions finement harmoniques.},
     journal = {Inventiones mathematicae},
     pages = {111--124},
     publisher = {mathdoc},
     volume = {29},
     year = {1975},
     zbl = {0312.31004},
     url = {http://geodesic.mathdoc.fr/item/IM_1975__29_142331/}
}