@article{GDZPPN002110202,
title = {Eigenvalue asymptotics for the Schr\"odinger operator with perturbed periodic potential.},
journal = {Inventiones mathematicae},
volume = {110},
year = {1992},
pages = {75-94},
zbl = {0801.35095},
url = {http://dml.mathdoc.fr/item/GDZPPN002110202}
}
Raikov, G.D. Eigenvalue asymptotics for the Schrödinger operator with perturbed periodic potential.. Inventiones mathematicae, Tome 110 (1992) pp. 75-94. http://gdmltest.u-ga.fr/item/GDZPPN002110202/