| An Upper Bound of 62 on the Classical Ramsey Number R(3, 3, 3, 3) Recent countries visiting this post |  |
 | 3 | United States |
 | 1 | Russian Federation |
| An Upper Bound of 62 on the Classical Ramsey Number R(3, 3, 3, 3) Recent countries visiting this post | |
| 3 | United States |
| 1 | Russian Federation |