References
- Cornea , A. 1984 . “ Colloque de Théoriedu Potential-Jacques Deny ” . In Continuity of Reduites and Balayaged Functions Edited by: Mokobodzki , G. and Pinchon , D. 173 – 182 . Berlin, New York Heidelberg Springer Lecture Notes No. 1096
- Doob , J. L. 1984 . Classical Potential Theory and its Probabilistic Counterpart , Berlin, New York : Springer . Heidelberg
- Gilbarg , D and Trudinger , N. S. 1977 . Elliptic Partial Differential Equations of Second order , Berlin, New York : Springer . Heidelberg
- Hayman , W. K. , Kershaw , D. and Lyons , T. J. 1984 . “ Anniversary Volume on Approximation Theory and Functional Analysis ” . In The Best Harmonic Approximant to a Continuous Function , Edited by: Butzer , P. L. , Stens , R. L. and Sz.-Nagy , B . Vol. 65 , 317 – 327 . New York : Academic Press . ISNM
- Heinonen , J. and Kilpeläinen , T. 1988 . On the Wiener Criterion and Quasilinear Obstacle Problems . Trans. A.M.S , 310 : 239 – 255 .
- Heinonen , J. and Kilpeläinen , T. 1988 . A;-Superharmonic Functions and Supersolutions of Degenerate Elliptic Equations . Art Mat. , 26 : 87 – 105 .
- Helms , L. L. 1969 . Introduction to Potential Theory , New York : John Wiley & Sons .
- Kilpeläinen , T. 1989 . Potential Theory for Supersolutions of Degenerate Elliptic Equations . Indiana Math. J. , 38 : 253 – 275 .
- Landkof , N. S. 1972 . Foundations of Modern Potential Theory , Berlin, New York : Springer . Heidelberg
- Lehtola , P. 1986 . An Axiomatic Approach to Non-Linear Potential Theory . Ann. Acad Sci. Fenn. Ser. A I Math. Diss. , 62 : 1 – 40 .
- Lehtola , P . 1988 . The Obstacle Problem in a Non-Linear Potential Theory , Edited by: Král , J. , Lukeψ , J. , Netuka , L and Veselý , J. 209 – 213 . New York : Plenum . in Potential Theory
- Lewis , J. 1983 . Regularity of the Derivatives of Solutions to Certain Elliptic Equations . Indiana Univ. Math, J , 32 : 849 – 58 .
- Lindqvist , P . 1986 . On the Definition and Properties of p; -Superharmonic Functions . J. Reine Angew. Math. , 365 : 67 – 79 .
- Lindqvist , P. and Martio , O. 1985 . Two Theorems of N. Wiener for Solutions of Quasilinear Elliptic Equations . Acta Math. , 155 : 153 – 171 .
- Manfredi , J. J. 1988 . ρ-Harmonic Functions in the Plane . Proc. A.M.S. , 103 : 473 – 479 .
- Ubhaya , V. 1988 . Uniform Approximation by Quasi-Convex and Convex Functions . J. Approx. Theory , 55 : 326 – 336 .
- Wilson , J. M. and Zwick , D. “ Best Approximation by Subharmonic Functions ” . In Proc. A.M.S. to appear
- Zwick , D. 1990 . The Obstacle Problem and Best Superharmonic Approximation, in Multivariate Approximation and Interpolation , Edited by: Haussmann , W. and Jetter , K. Vol. 94 , 313 – 324 . Basel : Birkhäuser . ISNM