| 1 | The Institute of Sinology at the University of Leiden houses a collection of van Gulik's books and manuscripts. | |
| 2 | Having raised gibbons , studied their ecology, and written The Gibbon in China, van Gulik can also be termed a zoologist. | |
| 3 | Sinology was an amateur avocation for van Gulik, but his outstanding achievements in it have made the world forget that his "proper career" was diplomacy. | |
| 4 | Zhang hoped that as families of Mr. Gulik, they could play a positive role in promoting cultural and people-to-people exchanges between China and the Netherlands. |
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