Hussain, N.; Salim, M. R.; Azmi, A. I.; Mohd Noor, M. Y.; Abdullah, A. S.; Ahmad, F.; Mohd Haniff, I. Performance of Graphene Nanopowder-Polyvinyl Alcohol in Optical Pulse Generation at 1.5 Micron Region. Photonics Lett. Pol. 2021, 13, 55-57.