To cite `spam64` in publications use:

Gerber F, Moesinger K, Furrer R (2017). “Extending R packages to support 64-bit compiled code: An illustration with spam64 and GIMMS NDVI3g data.” Computer & Geoscience, 104, 109–119. ISSN 0098-3004, doi: 10.1016/j.cageo.2016.11.015.

Gerber F, Moesinger K, Furrer R (2017). “dotCall64: An efficient interface to compiled C/C++ and Fortran code supporting long vectors.” arXiv. https://arxiv.org/abs/1702.08188.

Corresponding BibTeX entries:

  @Article{,
    title = {Extending {R} packages to support 64-bit compiled code: An
      illustration with spam64 and {GIMMS} {NDVI3g} data},
    author = {Florian Gerber and Kaspar Moesinger and Reinhard Furrer},
    journal = {Computer & Geoscience},
    year = {2017},
    volume = {104},
    pages = {109--119},
    issn = {0098-3004},
    doi = {10.1016/j.cageo.2016.11.015},
  }

  @Article{,
    title = {{dotCall64}: An efficient interface to compiled {C/C++}
      and {F}ortran code supporting long vectors},
    author = {Florian Gerber and Kaspar Moesinger and Reinhard Furrer},
    journal = {arXiv},
    year = {2017},
    url = {https://arxiv.org/abs/1702.08188},
  }