@article{SM_2016_207_10_a1,
     author = {V. A. Vassiliev},
     title = {Local {Petrovskii} lacunas close to parabolic singular points of the wavefronts of~strictly hyperbolic partial differential equations},
     journal = {Sbornik. Mathematics},
     pages = {1363--1383},
     publisher = {mathdoc},
     volume = {207},
     number = {10},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2016_207_10_a1/}
}