J. P. da Silva, Einstein G. dos Santos, and Marcos T. B. Segundo. “DIRECTIONAL COUPLER BASED ON A PHOTONIC QUASI-CRYSTAL FIBER WITH EXTENDED CORES”. Journal of Microwaves, Optoelectronics and Electromagnetic Applications (JMOe), vol. 17, no. 2, Sept. 2018, pp. 201-7, doi:10.1590/2179-10742018v17i21137.