@article{JEMS_2013_15_5_a2,
     author = {Jonathan Luk},
     title = {The null condition and global existence for nonlinear wave equations on slowly rotating {Kerr} spacetimes},
     journal = {Journal of the European Mathematical Society},
     pages = {1629--1700},
     publisher = {mathdoc},
     volume = {15},
     number = {5},
     year = {2013},
     doi = {10.4171/jems/400},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/400/}
}