@article{AA_2004_16_1_a2,
     author = {M. S. Agranovich and G. V. Rozenblum},
     title = {Spectral boundary problems for {Dirac} systems with a~singular potential},
     journal = {Algebra i analiz},
     pages = {33--69},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2004_16_1_a2/}
}