@article{ZNSL_1984_133_a2,
     author = {V. I. Arnol'd},
     title = {Several remarks on elliptic coordinates},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {38--50},
     year = {1984},
     volume = {133},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_133_a2/}
}