Operators and Matrices · Volume 12, Issue 3 Linear differential operator with an involution as a generator of an operator group 12-43 Pages 723-756 DOI 10.7153/oam-2018-12-43 Downloads Short PDF Full PDF PNG Authors Anatoly G. Baskakov Ilya A. Krishtal Natalia B. Uskova Keywords spectral asymptotic analysis method of similar operators mixed problem operator groups Subject classes 35L75 35Q53 37K10 37K35