in order to modify display of article links and make it consistent (both when they display as results of search/browse and when listed as volume index, either current or archival), I think useful created a specific function. In this way it can be changed once whenever it occurs. This solution may be useful also to improve subscribers management or for new developments.
The code line where you must insert the call at the function are:
search.php -> line from 673 to 721 and line from 782 to 830;
viewissue.php -> line from 179 to 259.
My solutions is available at:
: my solution displays, depending from the section's configuration, link to abstract or to abstract/full text. The full text links are displayed only if there are available and accessible for the specific user.