%0 Journal Article %A Boman, Jan %T On the closure of spaces of sums of ridge functions and the range of the $X$-ray transform %J Annales de l'Institut Fourier %D 1984 %P 207-239 %V 34 %N 1 %I Imprimerie Louis-Jean %C Gap %U https://aif.centre-mersenne.org/articles/10.5802/aif.957/ %R 10.5802/aif.957 %G en %F AIF_1984__34_1_207_0