Mahuya Sasmal, Palash Ray, Mrinmoy Sen,Rajesh Mukherjee, Shaon Bandyopadhyay. (2022). A Brief Review on Text and Image CAPTCHA. Turkish Journal of Computer and Mathematics Education (TURCOMAT), 11(1), 508–526. https://doi.org/10.17762/turcomat.v11i1.11876