To cite HKprocess in publications use:

Tyralis H, Koutsoyiannis D (2014). “A Bayesian statistical model for deriving the predictive distribution of hydroclimatic variables.” Climate Dynamics, 42, 2867–2883. doi:10.1007/s00382-013-1804-y.

Corresponding BibTeX entry:

  @Article{,
    title = {A Bayesian statistical model for deriving the predictive
      distribution of hydroclimatic variables},
    author = {Hristos Tyralis and Demetris Koutsoyiannis},
    journal = {Climate Dynamics},
    year = {2014},
    volume = {42},
    pages = {2867--2883},
    doi = {10.1007/s00382-013-1804-y},
  }