@article{SM_2001_192_10_a0,
     author = {S. V. Zakharov and A. M. Il'in},
     title = {From weak discontinuity to gradient catastrophe},
     journal = {Sbornik. Mathematics},
     pages = {1417--1433},
     publisher = {mathdoc},
     volume = {192},
     number = {10},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2001_192_10_a0/}
}