To cite package intamap in publications use:

Pebesma E, Cornford D, Dubois G, Heuvelink G, Hristopoulos D, Pilz J, Stoehlker U, Morin G, Skoien J (2010). “INTAMAP: the design and implementation of an interoperable automated interpolation web service.” Computers & Geosciences, 37, 343-352. http://dx.doi.org/10.1016/j.cageo.2010.03.019.

Corresponding BibTeX entry:

  @Article{,
    title = {INTAMAP: the design and implementation of an interoperable
      automated interpolation web service},
    author = {E. Pebesma and D. Cornford and G. Dubois and G.B.M.
      Heuvelink and D. Hristopoulos and J. Pilz and U. Stoehlker and G.
      Morin and J.O. Skoien},
    journal = {Computers & Geosciences},
    year = {2010},
    volume = {37},
    pages = {343-352},
    url = {http://dx.doi.org/10.1016/j.cageo.2010.03.019},
  }