@article{MZM_2019_106_5_a0,
     author = {V. E. Vladykina and A. A. Shkalikov},
     title = {Regular {Ordinary} {Differential} {Operators} with {Involution}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {643--659},
     publisher = {mathdoc},
     volume = {106},
     number = {5},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2019_106_5_a0/}
}