there are lot of citations, which authors generally find missing from their citations count.  There is no single comprehensive citation index which may figure out each and every citation. although google scholar is has bit wider coverage, but still it misses out lots of citations. it would be ideal if RG would add an app whereby researcher be given freedom to upload all such open access articles in which they find there work has been cited. but this should be different from publication and supplementary files tab and should not count as publications. this may help in giving, if not exhaustive but a comprehensive coverage to citations count. it would also help in adding OA articles to the RG repository for easy access and greater visibility.