If you are studying in a university with advanced library and information services, probably you have seen a sign like this
in front of every item in the results of your search when you search some databases. SFX
is another technology related to link management which is being applied by libraries to make access to material easier for end users. when for example you search Eric database and you see the results, by clicking on SFX sign either you will be taken to full text
of that article if your library has access to or you will be given a chance to do an authomated search of library catalogue
in order to find if the print or electronic copy of that item is available in your library.