| The R*-Tree: An Efficient and Robust Access Method for Points and Rectangles Recent countries visiting this post |  |
 | 3 | United States |
 | 1 | Russian Federation |
 | 1 | China |
| The R*-Tree: An Efficient and Robust Access Method for Points and Rectangles Recent countries visiting this post | |
| 3 | United States |
| 1 | Russian Federation |
| 1 | China |