%0 Journal Article %A R. Beals %A E. A. Kartashova %T Constructively Factoring Linear Partial Differential Operators in Two Variables %J Teoretičeskaâ i matematičeskaâ fizika %D 2005 %P 165-180 %V 145 %N 2 %U http://geodesic.mathdoc.fr/item/TMF_2005_145_2_a2/ %G ru %F TMF_2005_145_2_a2