To cite cpi in publications use:

Watson DS, Wright MN (2011). “Testing conditional independence in supervised learning algorithms.” Machine Learning, 110(8), 2107–2129. https://doi.org/10.1007/s10994-021-06030-6.

Corresponding BibTeX entry:

  @Article{,
    title = {Testing conditional independence in supervised learning
      algorithms},
    author = {David S. Watson and Marvin N. Wright},
    journal = {Machine Learning},
    year = {2011},
    volume = {110},
    number = {8},
    pages = {2107--2129},
    url = {https://doi.org/10.1007/s10994-021-06030-6},
  }