  Citations among research papers, and the networks they form, are the primary
object of study in scientometrics. The act of making a citation reflects the
citer's knowledge of the related literature, and of the work being cited. We
aim to gain insight into this process by studying citation keys: user-chosen
labels to identify a cited work. Our main observation is that the first listed
author is disproportionately represented in such labels, implying a strong
mental bias towards the first author.
