DOIs are a bit annoying as it seems that you need to pay money to be able to assign DOIs (for example Crossref membership starts at $275/year and they charge additional $1/registered item)
If all you want are nice, more stable and more “academic” citations, obtaining an ISSN might be a better option.
Last time I checked, it was fairly easy to obtain an ISSN (and its free):
You just send 1st issue (a bundle of at least 5 articles) to ISSN organization.Source: http://www.issn.org/wp-content/uploads/2013/09/ISSNguidelinesENG_03032014.pdf
For online sources you actually don’t need volumes and page numbers, you can simply assign article numbers (ascending, resets every year).
So the citation would look something like
Cooney, Mick (2017). Modelling loss curves in insurance with RStan. Stan Case Studies [article number]. Retrieved from
So almost the same, but Stan Case Studies is now in the ISSN database and can possibly be also recognized by some indexing authority.