A study identified more than two million articles that did not appear in a major digital archive, despite having an active DOI.Credit: Anna Berkut/Alamy More than one-quarter of scholarly articles are not being properly archived and preserved, a study of more than seven million digital publications suggests. The findings, published in the Journal of Librarianship and Scholarly Communication on 24 January1, indicate that systems to preserve papers online have failed to keep pace with the growth o...