BALIARSINGH, P. On Double Difference Operators via Four Dimensional Matrices. The Journal of the Indian Mathematical Society, [S. l.], v. 83, n. 3-4, p. 209–219, 2016. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/6604. Acesso em: 29 apr. 2024.