Fix duplicate detection

[koppor]

@inproceedings{zengler2013boolean,
  title={Boolean quantifier elimination for automotive configuration--a case study},
  author={Zengler, Christoph and K{\"u}chlin, Wolfgang},
  booktitle={International Workshop on Formal Methods for Industrial Critical Systems},
  pages={48--62},
  year={2013},
  organization={Springer}
}

is a dublicate of

@InProceedings{Zengler,
  author   = {Christoph Zengler and Wolfgang Küchlin},
  title    = {Boolean Quantifier Elimination for Automotive Configuration—A Case Study},
  abstract = {This paper evaluates different algorithms for existential Boo-
lean quantifier elimination in the area of automotive configuration. We
compare approaches based on model enumeration, on resolution, on de-
pendency sequents, on substitution, and on knowledge compilation with
projection. We describe two real-life applications: model counting on a
set of customer-relevant options and projection of BOM (bill of materi-
als) constraints. Our work includes an implementation of the presented
techniques on top of state-of-the-art tools. We evaluate the different ap-
proaches on real production data from our collaboration with BMW.},
  file     = {:C\:/Users/test/git-repositories/paper/bib/pdfs/ZenglerKuechlin_BooleanQEfor Automotive_FMICS_2013.pdf:PDF},
}

This should be detected

[koppor]

@InProceedings{Kopp2018a,
  author    = {Oliver Kopp and Uwe Breitenb{\"{u}}cher and Tamara M{\"{u}}ller},
  booktitle = {Proceedings of the 10th Central European Workshop on Services and their Composition, Dresden, Germany, February 8-9, 2018},
  title     = {CloudRef - Towards Collaborative Reference Management in the Cloud},
  year      = {2018},
  editor    = {Nico Herzberg and Christoph Hochreiner and Oliver Kopp and J{\"{o}}rg Lenhard},
  pages     = {63--68},
  publisher = {CEUR-WS.org},
  series    = {{CEUR} Workshop Proceedings},
  volume    = {2072},
  bibsource = {dblp computer science bibliography, https://dblp.org},
  biburl    = {https://dblp.org/rec/conf/zeus/KoppBM18.bib},
  timestamp = {Wed, 12 Feb 2020 16:44:55 +0100},
  url       = {http://ceur-ws.org/Vol-2072/paper10.pdf},
}

is a duplicate of (but JabRef does not say so)

@InProceedings{KoppEtAl-CloudRef2018,
  author    = {Kopp, Oliver and Breitenbücher, Uwe and Müller, Tamara},
  title     = {CloudRef -- Towards Collaborative Reference Management in the Cloud},
  booktitle = {Proceedings of the 10th Central European Workshop on Services and their Composition ({ZEUS} 2018)},
  year      = {2018},
  volume    = {2072},
  series    = {{CEUR} Workshop Proceedings},
  pages     = {63--68},
  publisher = {CEUR-WS.org},
  keywords  = {Workshop-Beitrag},
}

[koppor]

Similar:

@InBook{INBOOK-2018-01,
  pages     = {81--101},
  title     = {{A Detailed Analysis of IoT Platform Architectures: Concepts, Similarities, and Differences}},
  publisher = {Springer},
  year      = {2018},
  author    = {Jasmin Guth and Uwe Breitenb{\"u}cher and Michael Falkenthal and Paul Fremantle and Oliver Kopp and Frank Leymann and Lukas Reinfurt},
  series    = {Internet of Everything: Algorithms, Methodologies, Technologies and Perspectives},
  month     = jan,
  abstract  = {The IoT is ...},
  doi       = {10.1007/978-981-10-5861-5_4},
  keywords  = {Beitrag in Buch},
}

and

@InCollection{Guth2018,
  author    = {Jasmin Guth and Uwe Breitenb{\"{u}}cher and Michael Falkenthal and Paul Fremantle and Oliver Kopp and Frank Leymann and Lukas Reinfurt},
  booktitle = {Internet of Everything - Technology, Communications and Computing},
  publisher = {Springer},
  title     = {A Detailed Analysis of IoT Platform Architectures: Concepts, Similarities, and Differences},
  year      = {2018},
  editor    = {Beniamino Di Martino and Kuan{-}Ching Li and Laurence T. Yang and Antonio Esposito},
  pages     = {81--101},
  bibsource = {dblp computer science bibliography, https://dblp.org},
  biburl    = {https://dblp.org/rec/books/sp/18/GuthBFFKLR18.bib},
  doi       = {10.1007/978-981-10-5861-5\_4},
  timestamp = {Fri, 21 Aug 2020 17:12:07 +0200},
  url       = {https://doi.org/10.1007/978-981-10-5861-5\_4},
}