Ertman, Slawomir, Tomasz Nasilowski, Tomasz R. Wolinski, and Hugo Thienpont. “Highly Birefringent Microstructured Fiber Selectively Filled With Lossy Material”. Photonics Letters of Poland 1, no. 1 (March 28, 2009): pp. 13–15. Accessed April 25, 2024. https://www.photonics.pl/PLP/index.php/letters/article/view/1-5.