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LibreCat: https://research-explorer.ista.ac.at/record/8416
DOI: 10.17323/1609-4514-2019-19-2-307-327
arXiv: 1809.09341

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LibreCat: https://research-explorer.ista.ac.at/record/8501
DOI: 10.17323/1609-4514-2014-14-2-181-203
arXiv: 1304.3050