%0 Journal Article %A A. V. Isaev %A M. A. Mishchenko %T Affine classification of tube quadrics having one minus in the Levi form %J Matematičeskie zametki %D 1988 %P 145-146 %V 44 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1988_44_1_a14/ %G ru %F MZM_1988_44_1_a14