To cite package 'FDboost' itself use the manual; to cite functional linear array models use Brockhaus et al. (2015).

Brockhaus, S. ( 2016 ) FDboost: Boosting Functional Regression Models R package version 0.2-0

Brockhaus, S., Scheipl, F., Hothorn, T., and Greven, S. (2015), The Functional Linear Array Model. Statistical Modelling, 15(3), 279-300.

Corresponding BibTeX entries:

  @Manual{,
    title = {FDboost: Boosting Functional Regression Models},
    author = {Sarah Brockhaus and David R"ugamer},
    year = {2016},
  }
  @Article{,
    title = {The Functional Linear Array Model},
    author = {Sarah Brockhaus and Fabian Scheipl and Torsten Hothorn
      and Sonja Greven},
    journal = {Statistical Modelling},
    year = {2015},
    volume = {15},
    number = {3},
    pages = {279--300},
  }