@article{SMJ2_1997_23_3-4_a8,
     author = {Kirchev, K. and Borisova, G.},
     title = {Commuting {Nonselfadjoint} {Operators} and their {Characteristic} {Operator-Functions}},
     journal = {Serdica Mathematical Journal},
     pages = {313--334},
     publisher = {mathdoc},
     volume = {23},
     number = {3-4},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_1997_23_3-4_a8/}
}