There are many resources that record citation counts for published material. None are considered comprehensive.
Recent research indicates the number of uncited papers is less than 10% in most scientific fields.
Secondary documents are items not available in the Scopus database but are extracted from references found in Scopus.
Relative Citation Ratio (RCR) is a new metric that quantifies and compares the influence of a scientific article.
"... it works by counting an article’s network of citations, then weighting the result by using a comparison group within the article’s field. The developers of relative citation ratio said its methodology therefore better reflects how experts assess the influence of a paper, rather than just its total number of citations.” Chronicle of Higher Education Sept. 7, 2016
Many subject specialized databases provide times cited information. Below are some examples. See the Databases by Subject listings to check and see if a database in your discipline offers times cited information.