Core 2.4.1 - Complex. Ruby-doc.org .
Core 2.4.1 - Complex [link]Paper  bibtex   
@ONLINE{Rubycomplex,
  AUTHOR = {{Ruby-doc.org}},
  URL = {https://ruby-doc.org/core-2.4.1/Complex.html},
  TITLE = {Core 2.4.1 - Complex},
}
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