Mahuya Sasmal, Palash Ray, Mrinmoy Sen,Rajesh Mukherjee, Shaon Bandyopadhyay. A Brief Review on Text and Image CAPTCHA. TURCOMAT [Internet]. 2022 Jan. 2 [cited 2025 Oct. 21];11(1):508-26. Available from: https://turcomat.org/index.php/turkbilmat/article/view/11876