| P27 | country of citizenship | ... | Q29999 (Kingdom of the Netherlands) | Kingdom of the Netherlands |
| P184 | doctoral advisor | ... | Q20799223 (Harry van der Laan) | Harry van der Laan |
| P185 | doctoral student | ... | Q7359406 (Rogier Windhorst) | Rogier Windhorst |
| P185 | doctoral student | ... | Q102314298 (Hans Rudolf de Ruiter) | Hans Rudolf de Ruiter |
| P69 | educated at | ... | Q156598 (Leiden University) | Leiden University |
| P735 | given name | ... | Q2793400 (???) | ??? |
| P31 | instance of | ... | Q5 (human) | human |
| P106 | occupation | ... | Q11063 (astronomer) | astronomer |
| P21 | sex or gender | ... | Q6581097 (male) | male |
| P26 | spouse | ... | Q102313835 (Jeannette Kate Merkelijn) | Jeannette Kate Merkelijn |
| P8880 | AstroGen ID | 3231 |
| P213 | ISNI | 0000000398344698 |
| P549 | Mathematics Genealogy Project ID | 114555 |
| P1006 | Nationale Thesaurus voor Auteursnamen ID | 074529080 |
| P214 | VIAF cluster ID | 243320575 |
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log id: 1957689