@article{AIHPC_1992__9_2_147_0,
     author = {Craig, W. and Kappeler, T. and Strauss, W.},
     title = {Gain of regularity for equations of {KdV} type},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {147--186},
     publisher = {Gauthier-Villars},
     volume = {9},
     number = {2},
     year = {1992},
     mrnumber = {1160847},
     zbl = {0764.35021},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1992__9_2_147_0/}
}