| kNR-tree: a novel R-tree-based index for facilitating spatial window queries on any k relations among N spatial relations in mob Recent countries visiting this post |  |
 | 3 | |
 | 1 | United States |
| kNR-tree: a novel R-tree-based index for facilitating spatial window queries on any k relations among N spatial relations in mob Recent countries visiting this post | |
| 3 | |
| 1 | United States |