To cite picR in publications use:

Flores, J.E. (2021), A new class of information criteria for improved prediction in the presence of training/validation data heterogeneity [Unpublished PhD dissertation]. University of Iowa.

Corresponding BibTeX entry:

  @PhdThesis{,
    title = {A new class of information criteria for improved
      prediction in the presence of training/validation data
      heterogeneity},
    author = {Javier E. Flores},
    school = {University of Iowa},
    year = {2021},
    url =
      {https://iro.uiowa.edu/esploro/outputs/doctoral/A-new-class-of-information-criteria/9984097169902771},
  }