Evert, Stefan, Fotis Jannidis, Thomas Proisl, Steffen Pielström, Thorsten Vitt, Christof Schöch, and Isabella Reger. “Understanding and Explaining Delta Measures for Authorship Attribution.” Digital Scholarship in the Humanities, 2017. DOI: 10.1093/llc/fqx023. – PDF – Data and code.