%0 Journal Article %A S. I. Pokhozhaev %T On a~priori Estimates and Gradient Catastrophes of Smooth Solutions to Hyperbolic Systems of Conservation Laws %J Informatics and Automation %D 2003 %P 257-288 %V 243 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_2003_243_a18/ %G ru %F TRSPY_2003_243_a18