Please include individual Open Access articles that are published in subscription journals.
Many subscription journals include individual articles that are Open Access. These often carry a CC licence or can be Identified using the NISO standard: http://www.niso.org/workrooms/ali/
Please include them in the Open Access collection.
Thanks for your suggestion! Detecting on an article-by-article basis if something is available as an OA article or not is not something our current system is capable of, but we will take it into consideration as a future feature.