To cite bolognese in publications, please use:

Fenner, M. (2017). Bolognese: a Ruby library for conversion of DOI Metadata.
DataCite. https://doi.org/10.5438/n138-z3mk

A BibTeX entry for bolognese is

@misc{https://doi.org/10.5438/n138-z3mk,
  doi = {10.5438/n138-z3mk},
  url = {https://github.com/datacite/bolognese},
  author = {Fenner, Martin},
  keywords = {doi, metadata, crossref, datacite, schema.org, bibtex, codemeta},
  title = {Bolognese: a Ruby library for conversion of DOI Metadata},
  publisher = {DataCite},
  note = {Ruby gem and command-line utility for conversion of DOI metadata from and to different metadata formats, including schema.org.},
  year = {2017}
}