To cite SpATS in publications use:

  Maria Xose Rodriguez-Alvarez, Martin P. Boer, Fred A. van Eeuwijk,
  Paul H.C. Eilers (2018). Correcting for spatial heterogeneity in
  plant breeding experiments with P-splines. Spatial Statistics 23 52 -
  71 URL https://doi.org/10.1016/j.spasta.2017.10.003

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Correcting for spatial heterogeneity in plant breeding experiments with P-splines},
    journal = {Spatial Statistics},
    volume = {23},
    pages = {52-71},
    year = {2018},
    author = {Mar{\'i}a Xos{\'e} Rodr{\'i}guez-{\'A}lvarez and Martin P. Boer and Fred A. {van Eeuwijk} and Paul H.C. Eilers},
  }