@article{GDZPPN002231085,
title = {Estimates for the Eigenvalues of Hill's Equation and Applications for the Eigenvalues of the Laplacian on Toroidal Surfaces.},
journal = {Manuscripta mathematica},
volume = {67},
year = {1990},
pages = {295-308},
zbl = {0733.34080},
url = {http://dml.mathdoc.fr/item/GDZPPN002231085}
}
Beekmann, Brigitte; Lökes, Hermann. Estimates for the Eigenvalues of Hill's Equation and Applications for the Eigenvalues of the Laplacian on Toroidal Surfaces.. Manuscripta mathematica, Tome 67 (1990) pp. 295-308. http://gdmltest.u-ga.fr/item/GDZPPN002231085/