To cite package 'sperrorest' in publications use:

Brenning, A. 2012. Spatial cross-validation and bootstrap for the assessment of prediction rules in remote sensing: the R package 'sperrorest'. IEEE International Symposium on Geoscience and Remote Sensing IGARSS, in press.

Corresponding BibTeX entry:

  @InProceedings{,
    author = {Alexander Brenning},
    title = {Spatial cross-validation and bootstrap for the assessment
      of prediction rules in remote sensing: the R package
      'sperrorest'},
    booktitle = {IEEE International Symposium on Geoscience and Remote
      Sensing IGARSS},
    year = {2012},
    note = {In press},
  }