@article{FPM_2006_12_7_a16,
     author = {S. Ya. Startsev},
     title = {On the variational integrating matrix for hyperbolic systems},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {251--262},
     publisher = {mathdoc},
     volume = {12},
     number = {7},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2006_12_7_a16/}
}