To cite calibrate in publications use:

Graffelman J, van Eeuwijk F (2005). “Calibration of multivariate scatter plots for exploratory analysis of relations within and between sets of variables in genomic research.” Biometrical Journal, 47(6), 863–879.

Corresponding BibTeX entry:

  @Article{,
    title = {Calibration of multivariate scatter plots for exploratory
      analysis of relations within and between sets of variables in
      genomic research.},
    author = {Jan Graffelman and Fred {van Eeuwijk}},
    journal = {Biometrical Journal},
    year = {2005},
    volume = {47},
    number = {6},
    pages = {863--879},
  }