Astorga-Moreno, J., Mena Barboza, E., & García-Aspeitia, and M. (2019). Asymptotically equivalent functions and ultrafilters applied to noncommutative quantum cosmology. Revista Mexicana De Física, 65(5 Sept-Oct), 519–528. https://doi.org/10.31349/RevMexFis.65.519