@article{article78a08d11,
title   = {Need for investigating the optical transfer functions in several field orientations for nonisotropic radiographic systems},
author = {Schiabel, Homero and Slaets, Annie France Frère and Marques, P M A},
year = {1993},
doi = {10.1118/1.597146},
journal   = {Medical Physics}
}