| P184 | doctoral advisor | ... | Q102116320 (Lucas Johannes Smid) | Lucas Johannes Smid |
| P185 | doctoral student | ... | Q7817639 (Tom Snijders) | Tom Snijders |
| P185 | doctoral student | ... | Q57437840 (Casper Albers) | Casper Albers |
| P185 | doctoral student | ... | Q102213621 (Bojan Basrak) | Bojan Basrak |
| P185 | doctoral student | ... | Q102217503 (Albert Hendrik Kroese) | Albert Hendrik Kroese |
| P185 | doctoral student | ... | Q102217508 (Diemer Salomé) | Diemer Salomé |
| P185 | doctoral student | ... | Q102217512 (Egbert Adriaan van der Meulen) | Egbert Adriaan van der Meulen |
| P185 | doctoral student | ... | Q102218924 (Antonius Wilhelmus Ambergen) | Antonius Wilhelmus Ambergen |
| P185 | doctoral student | ... | Q102235000 (Klaas Poortema) | Klaas Poortema |
| P185 | doctoral student | ... | Q102235001 (Antonius Gerardus Steerneman) | Antonius Gerardus Steerneman |
| P185 | doctoral student | ... | Q102235002 (Otto Jan Kardaun) | Otto Jan Kardaun |
| P185 | doctoral student | ... | Q102235004 (Paul Martin de Jong) | Paul Martin de Jong |
| P185 | doctoral student | ... | Q102235005 (Johan Cornelis Akkerboom) | Johan Cornelis Akkerboom |
| P69 | educated at | ... | Q850730 (University of Groningen) | University of Groningen |
| P734 | family name | ... | Q37526756 (Schaafsma) | Schaafsma |
| P735 | given name | ... | Q15282375 (Willem) | Willem |
| P31 | instance of | ... | Q5 (human) | human |
| P6104 | maintained by WikiProject | ... | Q8487137 (WikiProject Mathematics) | WikiProject Mathematics |
| P106 | occupation | ... | Q1622272 (university teacher) | university teacher |
| P21 | sex or gender | ... | Q6581097 (male) | male |
| P2381 | Academic Tree ID | 88514 |
| P2016 | Catalogus Professorum Academiae Groninganae ID | 1216 |
| P6178 | Dimensions author ID | 0755612671.71 |
| P269 | IdRef ID | 233540997 |
| P213 | ISNI | 0000000116642401 |
| P409 | Libraries Australia ID | 35478486 |
| P244 | Library of Congress authority ID | n88660839 |
| P549 | Mathematics Genealogy Project ID | 49670 |
| P4955 | MR Author ID | 155425 |
| P8189 | National Library of Israel J9U ID | 987007444848205171 |
| P1006 | Nationale Thesaurus voor Auteursnamen ID | 072019042 |
| P1207 | NUKAT ID | n98044017 |
| P214 | VIAF cluster ID | 68051061 |
| P10832 | WorldCat Entities ID | E39PBJdcC6kw9KJRmQ8D4pT8md |
| P13591 | Yale LUX ID | person/56b683db-d617-4929-9f18-68658d10ac6d |
| P1556 | zbMATH author ID | schaafsma.willem |
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