_:nabc26ec35ed644ab9143d00b422a8db5xb2
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.semanticscholar.org/paper/A-paradox-in-Hele-Shaw-displacements-Pacsa/ba8200185b7917dd5c3c7f61f591a9c84325e81f>