@article{EJDE_2006__2006__a146,
     author = {Yu,  Yifeng},
     title = {A remark on {\(C^2\)} infinity-harmonic functions},
     journal = {Electronic journal of differential equations},
     year = {2006},
     volume = {2006},
     zbl = {1113.35026},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a146/}
}