There is a discussion about how to define this and a comment concluding that indeed by one metric the Magma paper is most cited here: https://mathoverflow.net/q

There is a discussion about how to define this and a comment concluding that indeed by one metric the Magma paper is most cited here: https://mathoverflow.net/questions/199978/the-most-cited-paper-in-mathematics https://mathoverflow.net/questions/199978/the-most-cited-pap... John Cannon, who started Magma, pushed very hard for people to cite that paper whenever they used Magma in a paper. We eventually did something similar with SageMath for a bit, but it felt weird having everybody cite a paper with me personally as the main author, when there are nearly 1000 contributors to Sage, so we made up a reference with the author “The Sage Developers”, or something like that. As a result there is probably no MathSciNet entry tracking citations to Sagemath even though many papers cite Sagemath.