@article{TRSPY_2006_254_a1,
     author = {N. B. Medvedeva},
     title = {On the {Analytic} {Solvability} of the {Problem} of {Distinguishing} between {Center} and {Focus}},
     journal = {Informatics and Automation},
     pages = {11--100},
     publisher = {mathdoc},
     volume = {254},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2006_254_a1/}
}