%0 Journal Article %A M. Z. Solomyak %T A mathematical model for a noninvertible quantum graph %J Algebra i analiz %D 2005 %P 190-231 %V 17 %N 5 %U http://geodesic.mathdoc.fr/item/AA_2005_17_5_a6/ %G ru %F AA_2005_17_5_a6