Anuja Ray Chaudhuri. “A Comparison Study of Non-Standard Analysis and Non-Archimedean Ultrametric Theory”. International Journal of Emerging Trends in Science and Technology 3, no. 02 (February 28, 2016): 3601–3607. Accessed February 24, 2025. http://ijetst.in/index.php/ijetst/article/view/1021.