@article{article8237805a,
title   = {An extension of the effective index method to analyze leakage losses in RIB type WA veguides},
author = {Borges, Ben-Hur V. and Romero, Murilo Araújo and Cesar, Amilcar Careli},
year = {1999},
journal   = {Internationsal Journal of Infrared and Millimeter Waves}
}