VOL. 18 | 2008
Chapter 2. Part 3A. The canonical $S$-operator and the canonical class of linear differential equations of second order on algebraic function field $L$ of one variable over $\mathbf{C}$, and their algebraic characterizations when $L$ is "arithmetic"
Yasutaka Ihara
MSJ Memoirs, 2008: 109-125 (2008)
DOI: 10.2969/msjmemoirs/01801C02-3A0