@article{JEMS_2008_10_2_a8,
     author = {Sergiu Klainerman and Igor Rodnianski},
     title = {Sharp $L^1$ estimates for singular transport equations},
     journal = {Journal of the European Mathematical Society},
     pages = {477--505},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {2008},
     doi = {10.4171/jems/119},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/119/}
}