| scholarly article | Q13442814 |
| P356 | DOI | 10.2307/2039353 |
| P888 | JSTOR article ID | 2039353 |
| P894 | zbMATH Open document ID | 0299.04003 |
| P50 | author | Harvey M. Friedman | Q89912954 |
| P433 | issue | 1 | |
| P6104 | maintained by WikiProject | WikiProject Mathematics | Q8487137 |
| P304 | page(s) | 190 | |
| P577 | publication date | 1974-03-01 | |
| P1433 | published in | Proceedings of the American Mathematical Society | Q3406325 |
| P1476 | title | On Closed Sets of Ordinals | |
| P478 | volume | 43 |
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