@article{SJIM_2006_9_3_a13,
     author = {E. V. Chistyakova and V. F. Chistyakov},
     title = {On the existence of periodic solutions of differential-algebraic equations},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {148--158},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2006_9_3_a13/}
}