@article{CRMATH_2004__338_8_599_0,
     author = {Brezis, Ha{\i}\ensuremath{\ddot{}}m and Ponce, Augusto C.},
     title = {Kato's inequality when {\ensuremath{\Delta}\protect\emph{u}} is a measure},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {599--604},
     publisher = {Elsevier},
     volume = {338},
     number = {8},
     year = {2004},
     doi = {10.1016/j.crma.2003.12.032},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2003.12.032/}
}