Operators and Matrices · Volume 5, Issue 4 The similarity problem for indefinite Sturm-Liouville operators with periodic coefficients 05-50 Pages 707-722 DOI 10.7153/oam-05-50 Downloads Short PDF Full PDF PNG Authors Aleksey Kostenko Keywords J-self-adjoint operator Sturm-Liouville operator similarity critical points Subject classes 47E05 34B24 34B09 34L10 47B50