Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1996__304_4_165396, author = {Jaroslaw Wr\'oblewski}, title = {A counterexample to the {L{\texttwosuperior}} estimate {//Xyu//...C(//X...u//} + {//Y...u//} + //u//).}, journal = {Mathematische Annalen}, pages = {93--98}, publisher = {mathdoc}, volume = {304}, number = {4}, year = {1996}, zbl = {0835.47037}, url = {http://geodesic.mathdoc.fr/item/MAN_1996__304_4_165396/} }
Jaroslaw Wróblewski. A counterexample to the L² estimate //Xyu//...C(//X...u// + //Y...u// + //u//).. Mathematische Annalen, Tome 304 (1996) no. 4, pp. 93-98. http://geodesic.mathdoc.fr/item/MAN_1996__304_4_165396/