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"OPT+: A Monotonic Alternativeto OPTIONAL in SPARQL."
Sijin Cheng, Olaf Hartig (2019)
- Sijin Cheng

, Olaf Hartig:
OPT+: A Monotonic Alternativeto OPTIONAL in SPARQL. J. Web Eng. 18(1-3): 169-206 (2019)

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