Operators and Matrices · Volume 7, Issue 4 Indefinite Sturm-Liouville operators with periodic coefficients 07-44 Pages 777-811 DOI 10.7153/oam-07-44 Downloads Short PDF Full PDF PNG Authors Friedrich Philipp Keywords Sturm-Liouville operator periodic coefficients indefinite weight Subject classes 34B09 34B24 34L10 47B50 47E05