The smoots Package in R for Semiparametric Modeling of Trend Stationary Time Series
Y. Feng, T. Gries, S. Letmathe, D. Schulz, The R Journal 14 (2022) 182–195.

The smoots Package in R for Semiparametric Modeling of Trend Stationary Time Series
Y. Feng, T. Gries, S. Letmathe, D. Schulz, The R Journal 14 (2022) 182–195.

Smoof: Single- and Multi-Objective Optimization Test Functions
J. Bossek, The R Journal 9 (2017) 103–113.