@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/