@article{01184345, title = {Fourier analysis of null forms and nonlinear wave equations.}, journal = {Documenta Mathematica}, year = {1998}, pages = {49-55}, zbl = {0954.35112}, language = {en}, url = {http://dml.mathdoc.fr/item/01184345} }
Machedon, M. Fourier analysis of null forms and nonlinear wave equations.. Documenta Mathematica, (1998), pp. 49-55. http://gdmltest.u-ga.fr/item/01184345/