@article{RM_2020_75_4_a0,
     author = {P. B. Djakov and B. S. Mityagin},
     title = {Spectral triangles of non-selfadjoint {Hill} and {Dirac} operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {587--626},
     publisher = {mathdoc},
     volume = {75},
     number = {4},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2020_75_4_a0/}
}