%0 Journal Article %A Khristov, E. %T On the Transformations of Symplectic Expansions and the Respective Bäcklund Transformation for the KDV Equation %J Serdica Mathematical Journal %D 2003 %P 75-94 %V 29 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SMJ2_2003_29_1_a6/ %G en %F SMJ2_2003_29_1_a6