Geodesic
On the Principal Eigenvalues of Indefinite Elliptic Problems.
Mathematische Zeitschrift, Tome 195 (1987), pp. 29-36.

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Mots-clés : linear elliptic system, positive eigenvectors, theory of positive operators, Barta inequality 
@article{MZ_1987__195_183670,
     author = {W. Allegretto},
     title = {On the {Principal} {Eigenvalues} of {Indefinite} {Elliptic} {Problems.}},
     journal = {Mathematische Zeitschrift},
     pages = {29--36},
     publisher = {mathdoc},
     volume = {195},
     year = {1987},
     zbl = {0595.35040},
     url = {http://geodesic.mathdoc.fr/item/MZ_1987__195_183670/}
}
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W. Allegretto. On the Principal Eigenvalues of Indefinite Elliptic Problems.. Mathematische Zeitschrift, Tome 195 (1987), pp. 29-36. http://geodesic.mathdoc.fr/item/MZ_1987__195_183670/