@article{GDZPPN002083728,
title = {Periodic Schr\"odinger Operators on a Manifold.},
journal = {Forum mathematicum},
volume = {1},
year = {1989},
pages = {69-80},
zbl = {0655.58033},
url = {http://dml.mathdoc.fr/item/GDZPPN002083728}
}
Kobayashi, T.; Sunada, T.; Ono, K. Periodic Schrödinger Operators on a Manifold.. Forum mathematicum, Tome 1 (1989) pp. 69-80. http://gdmltest.u-ga.fr/item/GDZPPN002083728/