“…In this process, I found out that articles could get missing from the JCR and Web of Science (WoS) databases, which happened with 17 manuscripts published in 2018 that were disregarded in the 2019 JCR (Clarivate 2020, Kellner 2020a. This led to the introduction of the Missing Article Index (MAI, see Kellner 2020b), which for AABC-90 was 0.0567 considering the 2019 JCR (Kellner 2020c).…”