| P184 | doctoral advisor | ... | Q309861 (Jan Hendrik Oort) | Jan Hendrik Oort |
| P184 | doctoral advisor | ... | Q20799223 (Harry van der Laan) | Harry van der Laan |
| P69 | educated at | ... | Q156598 (Leiden University) | Leiden University |
| P734 | family name | ... | Q16883689 (Spoelstra) | Spoelstra |
| P735 | given name | ... | Q12902246 (Titus) | Titus |
| P735 | given name | ... | Q17497662 (Adrianus) | Adrianus |
| P735 | given name | ... | Q16428906 (Thomas) | Thomas |
| P31 | instance of | ... | Q5 (human) | human |
| P21 | sex or gender | ... | Q6581097 (male) | male |
| P8880 | AstroGen ID | 2145 |
| P269 | IdRef ID | 071465839 |
| P213 | ISNI | 0000000021495912 |
| P549 | Mathematics Genealogy Project ID | 114537 |
| P1006 | Nationale Thesaurus voor Auteursnamen ID | 068746873 |
| P1207 | NUKAT ID | n94300418 |
| P214 | VIAF cluster ID | 52983849 |
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log id: 1797611