Baty, Florent, Christian Ritz, Sandrine Charles, Martin Brutsche, Jean-Pierre Flandrois, and Marie-Laure Delignette-Muller. 2015. “A Toolbox for Nonlinear Regression in R: The Package Nlstools”. Journal of Statistical Software 66 (5):1-21. https://doi.org/10.18637/jss.v066.i05.