Extremal properties of the first eigenvalue of a class of elliptic eigenvalue problems
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Volume 14 (1987) no. 1, p. 1-48 
@article{ASNSP_1987_4_14_1_1_0,
     author = {Egnell, Henrik},
     title = {Extremal properties of the first eigenvalue of a class of elliptic eigenvalue problems},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 14},
     number = {1},
     year = {1987},
     pages = {1-48},
     zbl = {0649.35072},
     mrnumber = {937535},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1987_4_14_1_1_0}
}

Egnell, Henrik. Extremal properties of the first eigenvalue of a class of elliptic eigenvalue problems. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Volume 14 (1987) no. 1, pp. 1-48. http://www.numdam.org/item/ASNSP_1987_4_14_1_1_0/

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