To cite package 'spcosa' in publications use:

Walvoort D, Brus D, de Gruijter J (2022). Spatial Coverage Sampling and Random Sampling from Compact Geographical Strata. R package version 0.4-1, https://CRAN.R-project.org/package=spcosa.

de Gruijter J, Brus D, Bierkens M, Knotters M (2006). Sampling for Natural Resource Monitoring. Springer, Berlin. ISBN 978-3-540-22486-0.

Brus DJ, Spatjens LEEM, de Gruijter JJ (1999). “A sampling scheme for estimating the mean extractable phosphorus concentration of fields for environmental regulation.” Geoderma, 89, 129–148.

Walvoort DJJ, Brus DJ, de Gruijter JJ (2010). “An R package for spatial coverage sampling and random sampling from compact geographical strata by $k$-means.” Computers & Geosciences, 36, 1261–1267. Available online at https://dx.doi.org/10.1016/j.cageo.2010.04.005.

Brus DJ (2022). Spatial sampling with R. CRC Press.

See de Gruijter et. al. (2006) and Walvoort et al. (2010) for an introduction to spatial coverage sampling and its applications. Refer to Walvoort et al. (2022) for the spcosa package. See Brus et. al. (1999) for stratified simple random sampling for composites, and Brus (2022) for a textbook with exercises

Corresponding BibTeX entries:

  @Manual{,
    title = {Spatial Coverage Sampling and Random Sampling from Compact
      Geographical Strata},
    author = {Dennis Walvoort and Dick Brus and Jaap {de Gruijter}},
    year = {2022},
    note = {R package version 0.4-1},
    url = {https://CRAN.R-project.org/package=spcosa},
  }

  @Book{,
    title = {Sampling for Natural Resource Monitoring},
    author = {J. {de Gruijter} and D. Brus and M. Bierkens and M.
      Knotters},
    publisher = {Springer},
    address = {Berlin},
    year = {2006},
    note = {ISBN 978-3-540-22486-0},
  }

  @Article{,
    title = {A sampling scheme for estimating the mean extractable
      phosphorus concentration of fields for environmental regulation},
    author = {D. J. Brus and L. E. E. M. Spatjens and J. J. {de
      Gruijter}},
    journal = {Geoderma},
    year = {1999},
    volume = {89},
    pages = {129--148},
  }

  @Article{,
    title = {An R package for spatial coverage sampling and random
      sampling from compact geographical strata by $k$-means},
    author = {D. J. J. Walvoort and D. J. Brus and J. J. {de
      Gruijter}},
    journal = {Computers & Geosciences},
    year = {2010},
    volume = {36},
    pages = {1261--1267},
    note = {Available online at
      https://dx.doi.org/10.1016/j.cageo.2010.04.005},
  }

  @Book{,
    title = {Spatial sampling with R},
    author = {D. J. Brus},
    publisher = {CRC Press},
    year = {2022},
  }