@article {Electronic_Letters_1998, title = {Asymptotic evaluation of physical optics for the analysis of on-board antennas}, journal = {Electronic Letters}, volume = {34}, number = {5}, year = {1998}, month = {May}, pages = {418{\textendash}419}, author = {C{\'a}tedra, M. F. and Conde, O. and P{\'e}rez, Jes{\'u}s} }