References
- Chiti , G. 1979 . Rearrangements of functions and convergence in Orlicz space . Applicable Analysis , 9
- Federer , H. 1969 . Geometric measure theory , New York : Springer-Verlag .
- Huber , A. 1955 . Some results on generalized axially symmetric potential . Proc. Conf. partial Diff. eqs., Univ. of Maryland . 1955 .
- Keldys , M. W. 1951 . On certain cases of degeneration of equations of elliptic type on the boundary on a domain, Dole . Akad. Nauk , 11
- Lizorkin , P. I. 1961 . Greerfi £-fuiiction oi Boltrami's operator and some variational problems . Dokl. Akad. Sank , 139
- Maderna , C. and SaLu , S . 1979 . Symmctn/ation in Neumann problems . Applicable Analysis , 9
- Osserman , R. 1978 . The isopcrimeiric inequality . Bull. Amer. Math. Sue , 84
- Sperner , E. 1974 . Symnielribieiuiig fur funktionen mehrer reeller Variablen . Manuscripta Math , 11
- Talenti , G. 1966 . Soluzioni a simmetria assiale di equazioni ellittiche . Ann. Mat. pur a e appl. , 73
- Weinberger , H. 1974 . Variational methods for eigenvalue approximation . SIAM Philadelphia, Pa , 73
- Weinstein , A. 1953 . Generalized axially symmetric potential theory . Bull. Amer. Math. Soc , 73