Operators and Matrices · Volume 14, Issue 1 Canonical forms of self-adjoint boundary conditions for regular differential operators of order three 14-16 Pages 207-220 DOI 10.7153/oam-2020-14-16 Downloads Short PDF Full PDF PNG Authors Tian Niu Xiaoling Hao Jiong Sun Kun Li Keywords canonical forms differential operators boundary conditions Subject classes 34B24 34L15