S. E. · S. Erlander · Sven B. Erlander
| title | ISBN-13 (ISBN-10) | year of publication | |
|---|---|---|---|
| Optimal spatial interaction and the gravity model | 978-0-387-09729-9 (0-387-09729-5) | 1980 | |
| Optimal Spatial Interaction and the Gravity Model | 978-3-540-09729-7 (3-540-09729-5) | 1980 |