To cite RCAS in publications use:

  Bora Uyar, Dilmurat Yusuf, Ricardo Wurmus, Nikolaus Rajewsky, Uwe
  Ohler, Altuna Akalin; RCAS: an RNA centric annotation system for
  transcriptome-wide regions of interest. Nucleic Acids Res 2017
  gkx120. doi: 10.1093/nar/gkx120

A BibTeX entry for LaTeX users is

  @Article{,
    title = {RCAS: an RNA centric annotation system for transcriptome-wide regions of interest},
    author = {Bora Uyar and Dilmurat Yusuf and Ricardo Wurmus and Nikolaus Rajewsky and Uwe Ohler and Altuna Akalin},
    journal = {Nucleic Acids Research},
    year = {2017},
    doi = {doi:10.1093/nar/gkx120},
  }