Science & Technology Libraries
This study analyzes references cited by articles published in ten American Chemical Society journals between 2011 and 2015. The median age of references was 6 years. On average, 44% of the references were five years old or younger, and only 11% were more than 20 years old. There appears to be a modest increase in references to older sources, possibly due to the increased availability of older articles online. References tended to be concentrated on a small core of journals. Overall, 20% of the journals cited accounted for 80% of the references. However, there was considerable variation among subdisciplines.
Rose-Wiles, Lisa Madeleine and marzabadi, cecilia, "What do chemists cite? A five-year analysis of references cited in American Chemical Society journal articles." (2018). Library Publications. 161.