Lecian O. Reduced 2-dimensional Birkhoff surfaces of section of the desymmetrized P SL(2, Z) group: the Anosov characterization. ijmcr [Internet]. 21Feb.2023 [cited 15Mar.2025];11(2):3261-7. Available from: http://mail.ijmcr.in/index.php/ijmcr/article/view/526