@article{RLIN_1993_9_4_3_a6,
     author = {Ramaswamy, Sundararaja},
     title = {Maximum principle for viscosity sub solutions and viscosity sub solutions of the {Laplacian}},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni},
     pages = {213--217},
     publisher = {mathdoc},
     volume = {Ser. 9, 4},
     number = {3},
     year = {1993},
     zbl = {0822.35019},
     mrnumber = {1005611},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLIN_1993_9_4_3_a6/}
}