Sergio Luiz Stevan Jr, José Jair Alves Mendes Júnior, Frederich Conrad Janzen, Murilo Leme Oliveira, and Alexandre de Almeida Prado Pohl. “LONG PERIOD BRAGG GRATING IN COAXIAL TRANSMISSION LINES”. Journal of Microwaves, Optoelectronics and Electromagnetic Applications (JMOe), vol. 14, no. 1, Aug. 2015, pp. 28-39, doi:10.1590/2179-10742015v14i1424.