To cite package "svcm" in publications use:

S. Heim (2007). svcm: 2d and 3d space-varying coefficient models in R. R package version 0.1.2.

Corresponding BibTeX entry:

  @Manual{,
    title = {svcm: 2d and 3d space-varying coefficient models in R},
    author = {Susanne Heim},
    year = {2007},
    note = {R package version 0.1.2},
  }