@article{10_1023_A_1023265821269,
     author = {Ivanova, Petya N. and Gorman, Arthur D.},
     title = {On caustics associated with the linearized vorticity equation},
     journal = {Applications of Mathematics},
     pages = {255--262},
     publisher = {mathdoc},
     volume = {43},
     number = {4},
     year = {1998},
     doi = {10.1023/A:1023265821269},
     mrnumber = {1627993},
     zbl = {0938.34048},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1023/A:1023265821269/}
}