- Correlations in the scattered perfect optical vortices. Patnala Vanitha, Nijil Lal, Anju Rani, Bikash Kumar Das, GANGIREDDY SALLA, Ravindra Pratap Singh, Journal of Optics https://doi.org/10.1088/2040-8986/ac094f
- Scattering of perfect optical vortex beams: Physical unclonable function. Bikash Kumar Das, Patnala Vanitha, GANGIREDDY SALLA, Ravindra Pratap Singh, American Journal of Optics and Photonics, 10.11648/j.ajop.20210904.12
- Growth of ZnO thin film on Si and Quartz substrate by pulsed laser deposition. Bikash Kumar Das, Journal of Physics and Astronomy, Volume 7, Issue 9