To cite package geosptdb in publications use:

Melo, C., Melo, O. 2015. geosptdb: Spatio-Temporal; Inverse Distance Weighting and Radial Basis Functions with Distance-Based Regression R package version 0.5-0

Corresponding BibTeX entry:

  @Manual{,
    title = {geosptdb: Spatio-Temporal; Inverse Distance Weighting and
      Radial Basis Functions with Distance-Based Regression.},
    author = {C. Melo and O. Melo},
    year = {2015},
    url = {geosptdb.r-forge.r-project.org/},
    note = {R package version 0.5-0},
  }