[1]
J. J. Fernández-Durán and M. M. Gregorio-Domínguez, “CircNNTSR: An R Package for the Statistical Analysis of Circular, Multivariate Circular, and Spherical Data Using Nonnegative Trigonometric Sums”, J. Stat. Soft., vol. 70, no. 6, pp. 1–19, May 2016.