| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| The First International Lake Ladoga Symposium: Proceedings of the First International Lake Ladoga Symposium: Ecological Problems of Lake Ladoga, St. ... November 1993 | 978-O-7923-3972-4 (O-7923-3972-X) | 1996 | Heikki Simola · Markku Viljanen · Raj Murthy |