Comment (by Erik Schnetter):

Do I? It seems kind of obvious that, once we have a DOI for particular versions of the Einstein Toolkit, we would request people to cite these (in addition to the paper). Currently I “cite” the web pages instead, which is kind of useless.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2259/cannot-find-doi-for-einstein-toolkit