Geodesic
Boundary problems of the second order with an indefinite weight-function.
Journal für die reine und angewandte Mathematik, Tome 398 (1989), pp. 1-24.

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Mots-clés : behavior of the spectrum, symmetric, negative spectrum, multiplication operator, indefinite weight-function, uniformly elliptic, min.max. estimates, existence, perturbation theory, Haupt and Richardson indices 
@article{JRAM_1989__398_153139,
     author = {W. Allegretto and A.B. Mingarelli},
     title = {Boundary problems of the second order with an indefinite weight-function.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--24},
     publisher = {mathdoc},
     volume = {398},
     year = {1989},
     zbl = {0668.35073},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1989__398_153139/}
}
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W. Allegretto; A.B. Mingarelli. Boundary problems of the second order with an indefinite weight-function.. Journal für die reine und angewandte Mathematik, Tome 398 (1989), pp. 1-24. http://geodesic.mathdoc.fr/item/JRAM_1989__398_153139/