@article{EMJ_2012_3_4_a2,
     author = {S. A. Budochkina and V. M. Savchin},
     title = {On direct variational formulations for second order evolutionary equations},
     journal = {Eurasian mathematical journal},
     pages = {23--34},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2012_3_4_a2/}
}