@article{ARM_1983_19_1_a2,
     author = {Shekhter, B. L.},
     title = {On singular boundary value problems for two-dimensional differential systems},
     journal = {Archivum mathematicum},
     pages = {19--41},
     year = {1983},
     volume = {19},
     number = {1},
     mrnumber = {724306},
     zbl = {0535.34010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1983_19_1_a2/}
}