%0 Journal Article %A Eugene Trubowitz %A John Garnett %T Gaps and bands of one dimensional periodic Schrödinger operators, II. %J Commentarii mathematici Helvetici %D 1987 %P 18-37 %V 62 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMH_1987__62_140075/ %F CMH_1987__62_140075