@inproceedings{SPP-2018-PA-35, title={Topological charge of a vortex beam using Hadamard matrix pattern of circular apertures}, volume={36}, booktitle={Proceedings of the Samahang Pisika ng Pilipinas}, author={Estrada, Viron Alenton and Banguilan, Dina Grace Calbero and Hermosa, Nathaniel}, year={2018}, pages={SPP-2018-PA-35}, url={https://proceedings.spp-online.org/article/view/SPP-2018-PA-35} }