To cite package ‘MagpieNCGains’ in publications use:

  Chen D (2020). _MagpieNCGains: Easy conversion MAgPIE nc to GAINS
  mapping_. R package version 1.0.3,
  <https://github.com/pik-piam/magpiencgains>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {MagpieNCGains: Easy conversion MAgPIE nc to GAINS mapping},
    author = {David Meng-Chuen Chen},
    year = {2020},
    note = {R package version 1.0.3},
    url = {https://github.com/pik-piam/magpiencgains},
  }