Hiroshi Ogawara. Differential transcendence of solutions for q-difference equation of Ramanujan function. In Recent trends in formal and analytic solutions of diff. equations, volume 782 of Contemp. Math. 2023. 782. 143-153
Hiroshi Ogawara. On criteria for algebraic independence of collections of functions satisfying algebraic difference relations. Opuscula Mathematica. 2017. 37. 3. 457-472
Differential transcendence of general solutions to Mahler-type difference Riccati equations
(PDEs 2025: Recent Developments in Theory and Applications 2025)