%0 Journal Article %A È. I. Grigolyuk %A L. A. Fil'shtinskii %T Equivalent rigidity of biperiodic lattice strengthened by elastic rings %J Doklady Akademii Nauk %D 1969 %P 1254-1256 %V 187 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1969_187_6_a11/ %G ru %F DAN_1969_187_6_a11