Kappeler, Th.. "On the periodic spectrum of the 1-dimensional Schrödinger operator.." Commentarii mathematici Helvetici 65.1 (1990): 1-3. <http://eudml.org/doc/140178>.
@article{Kappeler1990, author = {Kappeler, Th.}, journal = {Commentarii mathematici Helvetici}, keywords = {Hill's equation; antiperiodic spectrum; gaps}, number = {1}, pages = {1-3}, title = {On the periodic spectrum of the 1-dimensional Schrödinger operator.}, url = {http://eudml.org/doc/140178}, volume = {65}, year = {1990}, }
TY - JOUR AU - Kappeler, Th. TI - On the periodic spectrum of the 1-dimensional Schrödinger operator. JO - Commentarii mathematici Helvetici PY - 1990 VL - 65 IS - 1 SP - 1 EP - 3 KW - Hill's equation; antiperiodic spectrum; gaps UR - http://eudml.org/doc/140178 ER -