To cite nlstools in publications use:
Baty F, Ritz C, Charles S, Brutsche M, Flandrois J, Delignette-Muller M (2015). “A Toolbox for Nonlinear Regression in R: The Package nlstools.” Journal of Statistical Software, 66(5), 1–21. doi: 10.18637/jss.v066.i05, https://www.jstatsoft.org/article/view/v066i05.
Corresponding BibTeX entry:
@Article{, title = {A Toolbox for Nonlinear Regression in {R}: The Package {nlstools}}, author = {Florent Baty and Christian Ritz and Sandrine Charles and Martin Brutsche and Jean-Pierre Flandrois and Marie-Laure Delignette-Muller}, journal = {Journal of Statistical Software}, year = {2015}, volume = {66}, number = {5}, pages = {1--21}, url = {https://www.jstatsoft.org/article/view/v066i05}, doi = {10.18637/jss.v066.i05}, }