Pysz, D., Stepien, R., Kujawa, I., Kasztelanic, R., Martynkien, T., Berghmans, F., … Buczynski, R. (2010). Development of silicate hollow core photonic crystal fiber. Photonics Letters of Poland, 2(1), pp. 7–9. https://doi.org/10.4302/photon. lett. pl.v2i1.104