NB: Nowadays an article may be published in both 'print'
(ie paper) and electronic formats, and so it may have two
distinct publication dates; if those dates correspond to
different years, the earliest of the those years is chosen
herein for listing purposes.
That means that a publication may be listed in a year other
than the one of its 'print' date (typically the preceding
year, when there is a mismatch).