Geodesic
Estimates for the Eigenvalues of Hill's Equation and Applications for the Eigenvalues of the Laplacian on Toroidal Surfaces.
Manuscripta mathematica, Tome 68 (1990) no. 2, pp. 295-308.

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Mots-clés : toroidal surfaces, Hill's equation, periodic eigenvalue problem, Sturm comparison theorem, estimating function, Schwarz derivative, eigenvalues of the Laplacian, global upper and lower bounds 
@article{MM2_1990__68_2_155528,
     author = {Brigitte Beekmann and Hermann L\"okes},
     title = {Estimates for the {Eigenvalues} of {Hill's} {Equation} and {Applications} for the {Eigenvalues} of the {Laplacian} on {Toroidal} {Surfaces.}},
     journal = {Manuscripta mathematica},
     pages = {295--308},
     publisher = {mathdoc},
     volume = {68},
     number = {2},
     year = {1990},
     zbl = {0733.34080},
     url = {http://geodesic.mathdoc.fr/item/MM2_1990__68_2_155528/}
}
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Brigitte Beekmann; Hermann Lökes. Estimates for the Eigenvalues of Hill's Equation and Applications for the Eigenvalues of the Laplacian on Toroidal Surfaces.. Manuscripta mathematica, Tome 68 (1990) no. 2, pp. 295-308. http://geodesic.mathdoc.fr/item/MM2_1990__68_2_155528/