Usually, the URL in your address bar will be a persistent
link. This can vary by journal, however, so always check the article
anything labeled persistent link, permalink, stable
link, link to this
Peter Subar's nutshell definition: "Open-access (OA) literature is digital, online, free of
charge, and free of most copyright and licensing restrictions." OA journals may or may not be peer-reviewed; those in the DOAJ are.