@article{TIMM_2007_13_2_a15,
     author = {D. V. Khlopin},
     title = {Euler's broken lines in systems with {Carath\'eodory} conditions},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {167--183},
     year = {2007},
     volume = {13},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2007_13_2_a15/}
}