_:nd647fbe9071440a29bfa8508c313f067xb1
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://link.springer.com/article/10.1007/s00726-008-0156-0?error=cookies_not_supported&code=5f901a31-e236-4219-9132-64150929bd37>