@article{GDZPPN002091992, title = {The Spectrum of Hill's Equation.}, journal = {Inventiones mathematicae}, volume = {29}, year = {1975}, pages = {217-274}, zbl = {0319.34024}, url = {http://dml.mathdoc.fr/item/GDZPPN002091992} }
Moerbeke, P. van; McKean, H.P. The Spectrum of Hill's Equation.. Inventiones mathematicae, Tome 29 (1975) pp. 217-274. http://gdmltest.u-ga.fr/item/GDZPPN002091992/