The SIGIR 2006 paper Formal Models for Expert Finding in Enterprise Corpora by Krisztian Balog, Leif Azzopardi, and Maarten de Rijke was awarded with a Test of Time Honorable Mention Award at this year’s SIGIR conference. The paper has over 680 citations according to Google Scholar at the time of writing. (Fun fact: this was Krisztian’s very first SIGIR paper.)