To cite bigGP in publications use:

Christopher J. Paciorek, Benjamin Lipshitz, Wei Zhuo, Prabhat, Cari G. Kaufman, Rollin C. Thomas (2015). Parallelizing Gaussian Process Calculations in R. Journal of Statistical Software, 63(10), 1-23. URL http://www.jstatsoft.org/v63/i10/.

Corresponding BibTeX entry:

  @Article{,
    title = {Parallelizing Gaussian Process Calculations in {R}},
    author = {Christopher J. Paciorek and Benjamin Lipshitz and Wei
      Zhuo and {Prabhat} and Cari G. Kaufman and Rollin C. Thomas},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {63},
    number = {10},
    pages = {1--23},
    url = {http://www.jstatsoft.org/v63/i10/},
  }