@article{JMAG_2005_12_1_a7,
     author = {I. Roitberg and A. Sakhnovich},
     title = {D'Alembert{\textendash}Liouville{\textendash}Ostrogradskii formula and related results},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {114--118},
     year = {2005},
     volume = {12},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2005_12_1_a7/}
}