License for software and documentation: GPL-3
Article in Journal of Open Hardware: https://openhardware.metajnl.com/articles/10.5334/joh.9/
This book was produced using the bookdown package (Xie 2017), which was built on top of R Markdown and knitr (Xie 2015).
Xie, Yihui. 2017. Bookdown: Authoring Books and Technical Documents with R Markdown. https://github.com/rstudio/bookdown.
Xie, Yihui. 2015. Dynamic Documents with R and Knitr. 2nd ed. Boca Raton, Florida: Chapman; Hall/CRC. http://yihui.name/knitr/.