“…These documents are distributed as follows: conference papers (306, or 41.92%), articles (276, or 37.81%), conference reviews (56, or 7.67%), reviews (42, or 5.75%), book chapters (34, 4.66%), notes (5, or 0.68%), early access (3, or 0.41%), books (3, 0.41%), proceedings papers (1, or 0.14%), erratum (1, 0.14%), letters (1, or 0.14%), and meeting abstracts (1, or 0.14%). Even though the percentage of proceedings, errata, letters, and meeting abstracts is small (4, or 0.46%), for some research areas these documents are significant [63]. Additionally, certain algorithms, such as the tree of science algorithm, select the most relevant literature, making it unnecessary to exclude this data from the outset.…”