| Number | Date | Country | Kind |
|---|---|---|---|
| 18315 A/84 | Dec 1984 | ITX |
| Number | Name | Date | Kind |
|---|---|---|---|
| 957666 | Ferguson | May 1910 | |
| 3184882 | Vega | May 1965 | |
| 3236004 | Christiansen | Feb 1966 | |
| 3546792 | Sherman | Dec 1970 | |
| 3577673 | Monestier | May 1971 | |
| 4484406 | Matsumoto et al. | Nov 1984 |
| Entry |
|---|
| Enigmi E. Ciochi Matematici, Volume Primo, Martin Gardner, Sansoni .COPYRGT.1983. |