|
Gold OA article (no APC)
|
Article published in gold OA journal website when published; instantly available on journal website when published
|
No
|
No
|
No
|
|
Gold OA article (with APC)
|
Article published in gold OA journal; instantly available on journal website when published
|
Yes
|
No
|
No
|
|
Delayed OA article
|
Free article published in delayed OA or subscription journal with delayed OA option
|
No
|
Yes
|
Yes
|
|
Hybrid article
|
Free article published in a subscription journal
|
Yes
|
Yes
|
No
|
|
Green OA article
|
Articles in subscription or hybrid journals which have been self-archived by the author or affiliated institution to provide free access
|
No
|
No
|
No
|
|
Other free access
|
Free article in subscription journal or journal for which the status is unknown
|
Unknown
|
Sometimes
|
Sometimes
|
|
Toll access
|
Article that can only be accessed through a subscription or pay-per-view model and has not been self-archived
|
No
|
Yes
|
Yes
|
|
Paper status unknown
|
Article for which the access status could not be determined
|
Unknown
|
Unknown
|
Unknown
|
