TY  - JOUR
AU  - Th. Kappeler
TI  - On the periodic spectrum of the 1-dimensional Schrödinger operator.
JO  - Commentarii mathematici Helvetici
PY  - 1990
SP  - 1
EP  - 3
VL  - 65
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1990__65_3_140178/
ID  - CMH_1990__65_3_140178
ER  -