http://www.jmlr.org/papers/volume11/lazaro-gredilla10a/lazaro-gredilla10a.pdf (Publisher version)
Lázaro-Gredilla, M., Quiñonero-Candela, J., Rasmussen, C., & Figueiras-Vidal, A. (2010). Sparse Spectrum Gaussian Process Regression. Journal of Machine Learning Research, 11, 1865-1881.