@article{IM2_2012_76_2_a7,
     author = {V. D. Sedykh},
     title = {On the topology of wave fronts in spaces of low dimension},
     journal = {Izvestiya. Mathematics },
     pages = {375--418},
     publisher = {mathdoc},
     volume = {76},
     number = {2},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2012_76_2_a7/}
}