To cite package ‘spMC’ in publications use:

  Sartore, L., Fabbri, P., & Gaetan, C. (2016) spMC: an R-package for
  3D lithological reconstructions based on spatial Markov chains.
  Computers and Geosciences. 94:40-47.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {spMC: an R-package for 3D lithological reconstructions based on
           spatial Markov chains},
    journal = {Computers and Geosciences},
    volume = {94},
    number = {C},
    pages = {40--47},
    year = {2016},
    author = {Luca Sartore and Paolo Fabbri and Carlo Gaetan},
    doi = {10.1016/j.cageo.2016.06.001},
    url = {https://doi.org/10.1016/j.cageo.2016.06.001},
  }

  Sartore, L. (2013) spMC: Modelling Spatial Random Fields with
  Continuous Lag Markov Chains. The R Journal. 5/2:16-28.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {spMC: Modelling Spatial Random Fields with Continuous Lag 
           Markov Chains},
    journal = {The R Journal},
    volume = {5},
    number = {2},
    pages = {16--28},
    year = {2013},
    month = {December},
    author = {Luca Sartore},
    issn = {2073-4859},
    doi = {10.32614/rj-2013-022},
    url = {https://doi.org/10.32614/RJ-2013-022},
  }