@article{MABA_1999_13_1-2_a8,
     author = {E. Bairomov and E. Kir},
     title = {Principal {Functions} of the {Non-Selfadjoint} {Operator} {Generated} by {System} of {Differential} {Equations}},
     journal = {Mathematica balkanica},
     pages = {85},
     publisher = {mathdoc},
     volume = {13},
     number = {1-2},
     year = {1999},
     url = {http://geodesic.mathdoc.fr/item/MABA_1999_13_1-2_a8/}
}