Ebner M, Lexow S. Development of a Collaborative Learning Game Using External Plastic Cards as an Input Device on an iPad. Int. J. Interact. Mob. Technol. [Internet]. 2014 Apr. 5 [cited 2024 Apr. 26];8(2):pp. 10-14. Available from: https://online-journals.org/index.php/i-jim/article/view/3543