Obreja, P., F. Comanescu, M. Purica, R. Gavrila, and D. Cristea. 2022. “Polymers Doped With Metal Oxide Nanoparticles With Controlled Refractive Index”. Polimery 52 (9):679-85. https://polimery.ichp.vot.pl/index.php/p/article/view/1462.