To cite the 'Langevin' package in publications use:

  Rinn P, Lind P, Wächter M, Peinke J (2016). “The Langevin Approach:
  An R Package for Modeling Markov Processes.” _Journal of Open
  Research Software_, *4*(1), e34. ISSN 2049-9647, doi:10.5334/jors.123
  <https://doi.org/10.5334/jors.123>.

A BibTeX entry for LaTeX users is

  @Article{Rinn2016,
    title = {The Langevin Approach: An R Package for Modeling Markov Processes},
    author = {Philip Rinn and Pedro G. Lind and Matthias Wächter and Joachim Peinke},
    journal = {Journal of Open Research Software},
    year = {2016},
    number = {1},
    pages = {e34},
    volume = {4},
    doi = {10.5334/jors.123},
    issn = {2049-9647},
    publisher = {Ubiquity Press},
  }

To cite the 'Langevin Approach' in publications use:

  Friedrich R, Peinke J, Sahimi M, Reza Rahimi Tabar M (2011).
  “Approaching complexity by stochastic methods: From biological
  systems to turbulence.” _Physics Reports_, *506*(5), 87-162. ISSN
  0370-1573, doi:10.1016/j.physrep.2011.05.003
  <https://doi.org/10.1016/j.physrep.2011.05.003>.

A BibTeX entry for LaTeX users is

  @Article{Friedrich2011,
    title = {Approaching complexity by stochastic methods: From biological systems to turbulence},
    author = {Rudolf Friedrich and Joachim Peinke and Muhammad Sahimi and Mohammed {Reza Rahimi Tabar}},
    journal = {Physics Reports},
    year = {2011},
    number = {5},
    pages = {87--162},
    volume = {506},
    doi = {10.1016/j.physrep.2011.05.003},
    issn = {0370-1573},
    publisher = {Elsevier BV},
  }