In the wake of a debate about its longtime editor’s potential Nazi-era links, historians are to have a closer look at German magazine Stern’s history, the publishers said on Monday. Historians at Germany’s Leibniz Institute for Contemporary History have been asked to investigate Henri Nannen’s role during the country’s Nazi era and its aftermath. “The research period will cover the years from the founding of Stern by Henri Nannen in 1948 until his departure in 1983,” a spokeswoman for publishers Bertelsmann explained. Researchers will be looking for “political, personal and content-related int…