@book{Wickham2016,
author = {Wickham, H.},
title= {Ggplot2: Elegant graphics for data analysis},
year = {2016},
doi = {10.1007/978-3-319-24277-4},
URL = {https://doi.org/doi:10.1007/978-3-319-24277-4},
address = {Houston, TX},
publisher = {Springer International Publishing},
}