%0 Journal Article %A N. V. Kurganova %A E. A. Lutkovskaya %A V. A. Terletsky %T Identity of Optimality Conditions for Elastic Vibrations in Different Auxiliary Interpretations of Wave Problem %J The Bulletin of Irkutsk State University. Series Mathematics %D 2014 %P 115-124 %V 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/IIGUM_2014_8_a8/ %G ru %F IIGUM_2014_8_a8