@article{MT_2004_7_2_a5,
     author = {V. V. Chueshev},
     title = {An~Explicit {Variational} {Formula} for {the~Monodromy} {Group}},
     journal = {Matemati\v{c}eskie trudy},
     pages = {126--158},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2004_7_2_a5/}
}