@article{CMFD_2003_2_a1,
     author = {V. M. Zakalyukin},
     title = {Simple {Coisotropic} {Caustics}},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {45--56},
     publisher = {mathdoc},
     volume = {2},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2003_2_a1/}
}