@article{DE_2003_39_11_a1,
     author = {D. V. Balandin and M. M. Kogan},
     title = {Necessary {Solvability} {Conditions} for {Multiparameter} {Riccati} {Equations} in the {Robust} {Output} {Feedback} $H^\infty${-Control} {Problem}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1452--1456},
     publisher = {mathdoc},
     volume = {39},
     number = {11},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_11_a1/}
}