%% If you really need to cite Wikipedia, then use the "Cite this page" tool:
%% The generated url includes the exact VERSION. Then fix the bibtex...
%% Insert additional curly brackets to prevent parsing of author names etc. 
@misc{enwiki:bibtex,
    author = "{Wikipedia contributors}",
    title = "{BibTeX} --- {Wikipedia}{,} The Free Encyclopedia",
    year = "2018",
    url = "https://en.wikipedia.org/w/index.php?title=BibTeX&oldid=830618636",
    note = "[Online; accessed 12-April-2018]"
}

@InProceedings{DBLP:conf/sigir/SpitzG16,
  author    = {Andreas Spitz and
               Michael Gertz},
  title     = {Terms over {LOAD:} Leveraging Named Entities for Cross-Document Extraction
               and Summarization of Events},
  booktitle = {Proceedings of the 39th International {ACM} {SIGIR} conference on
               Research and Development in Information Retrieval, {SIGIR} 2016, Pisa,
               Italy, July 17-21, 2016},
  pages     = {503--512},
  year      = {2016},
  doi       = {10.1145/2911451.2911529},
  timestamp = {Thu, 14 Jul 2016 19:46:27 +0200},
  biburl    = {https://dblp.org/rec/bib/conf/sigir/SpitzG16},
  bibsource = {dblp computer science bibliography, https://dblp.org}
}

@Book{FeldmanSanger2007,
  title = {The Text Mining Handbook: Advanced Approaches in Analyzing Unstructued Data},
  publisher = {Cambridge University Press},
  year = {2007},
  author = {Ronan Feldman and James Sanger},
  address = {New York, NY, USA}
}
