| title | ISBN-13 (ISBN-10) | year of publication | |
|---|---|---|---|
| Asymptotic Analysis for Integrable Connections with Irregular Singular Points | 978-3-540-13375-9 (3-540-13375-5) | 2009 | |
| Asymptotic Analysis for Integrable Connections With Irregular Singular Points | 978-0-387-13375-1 (0-387-13375-5) | 1984 |