Users of OpenQBMM should cite it as follows:
OpenQBMM, Zenodo, 2019. doi:10.5281/zenodo.591651.
whenever referring to a specific version is not needed.
If citing a specific version is necessary, the appropriate citation can be found on the Zenodo page for OpenQBMM. For example, for version 5, which builds on OpenFOAM 7, the citation would read:
A. Passalacqua, J. Heylmun, M. Icardi, E. Madadi, P. Bachant, X. Hu, OpenQBMM 5.0.0 for OpenFOAM 7, Zenodo, 2019. doi:10.5281/zenodo.3471804.