@article{IM_1980__61_142753,
     author = {Neil S. Trudinger},
     title = {Local {Estimates} for {Subsolutions} and {Supersolutions} of {General} {Second} {Order} {Elliptic} {Quasilinear} {Equations.}},
     journal = {Inventiones mathematicae},
     pages = {67--80},
     publisher = {mathdoc},
     volume = {61},
     year = {1980},
     zbl = {0453.35028},
     url = {http://geodesic.mathdoc.fr/item/IM_1980__61_142753/}
}