@article{AIF_1990__40_2_443_0, author = {Greenleaf, Allan and Uhlmann, Gunther}, title = {Composition of some singular {Fourier} integral operators and estimates for restricted $X$-ray transforms}, journal = {Annales de l'Institut Fourier}, pages = {443--466}, publisher = {Institut Fourier}, address = {Grenoble}, volume = {40}, number = {2}, year = {1990}, doi = {10.5802/aif.1220}, zbl = {0695.58026}, mrnumber = {91k:58126}, language = {en}, url = {https://aif.centre-mersenne.org/articles/10.5802/aif.1220/} }