_:nad2a1e956df34557bb65253850ce6ae7xb3
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://link.springer.com/article/10.1007/BF00361392?error=cookies_not_supported&code=c406cd19-0a6d-48ff-aed3-64e687050cc1>