Possolt, M., Škereň, M., Svoboda, J. Optical security elements based on waveguide effects. In: KOVAČIČINOVÁ, J., VÍT, T., eds. Proceedings of SPIE Vol. 9442: Optics and Measurement Conference 2014. Vol. 9442. Bellingham: SPIE-INT SOC OPTICAL ENGINEERING, 2015, s. 944214-944214. SPIE. ISBN 978-1-62841-557-5. ISSN 0277-786X. Available: https://doi.org/10.1117/12.2175918.