@article{DOCMA_1998__S8__a13,
     author = {Smith, Hart F.},
     title = {Wave equations with low regularity coefficients},
     journal = {Documenta mathematica},
     pages = {723--730},
     publisher = {mathdoc},
     volume = {ICM Berlin 1998, Vol. II},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_1998__S8__a13/}
}