Comment (by Roland Haas):

For the record, there is currently no officially requested or suggested citation for Baikal (on http://einsteintoolkit.org/citation.html). @Zach Etienne suggested using the original NRPy+ paper https://arxiv.org/abs/1712.07658 until one is added.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2299/proposal-add-baikaletk-to-the-toolkit