%0 Journal Article %A N. I. Akhiezer %A I. G. Petrovskii %T S.\,N.~Bernshtein's contribution to the theory of partial differential equations %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1961 %P 1-15 %V 16 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1961_16_2_a0/ %G en %F RM_1961_16_2_a0