https://drops.dagstuhl.de/entities/document/10.4230/DagSemRep.60
https://drops.dagstuhl.de/entities/document/10.4230/DagSemRep.64
https://drops.dagstuhl.de/entities/document/10.4230/DagSemRep.76
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https://drops.dagstuhl.de/entities/document/10.4230/DagSemRep.101
https://drops.dagstuhl.de/entities/document/10.4230/DagSemRep.102