To cite package gfboost in publications use:
Werner T (2020). Gradient-Free Gradient Boosting.. Dissertation, Carl von Ossietzky University Oldenburg.
Corresponding BibTeX entry:
@PhdThesis{,
title = {Gradient-Free Gradient Boosting.},
author = {Tino Werner},
language = {English},
year = {2020},
school = {Carl von Ossietzky University Oldenburg},
type = {Dissertation},
uri = {https://oops.uni-oldenburg.de/id/eprint/4290},
}