@article{paperid:1027559,
author = {Saberi Fathi, Seyed Majid and T T Truong},
title = {On the inverse of the directional derivative operator in RN},
journal = {Journal of Physics A: Mathematical and Theoretical},
year = {2009},
volume = {42},
number = {4},
month = {January},
issn = {1751-8113},
pages = {45203--45221},
			numpages = {18},
keywords = {Directional derivative; x-ray transform; Radon transform},
}