Ojeda-Castaneda, Jorge, Sergio Ledesma, and Cristina Margarita Gomez-Sarabia. “Tunable Apodizers and Tunable Focalizers Using Helical Pairs”. Photonics Letters of Poland 5, no. 1 (March 28, 2013): pp. 20–22. Accessed November 20, 2024. http://m.photonics.pl/PLP/index.php/letters/article/view/5-8.