@article{RM_2021_76_5_a6,
     author = {A. A. Shkalikov},
     title = {Regular spectral problems for systems of ordinary differential equations of the first order},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {939--941},
     publisher = {mathdoc},
     volume = {76},
     number = {5},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2021_76_5_a6/}
}