CSM: "Stylometry"

Christian Science Monitor | Is that painting real? Ask a mathematician : Engineers use a mathematical process dubbed 'stylometry' to set apart real Van Gogh paintings from forgeries.

Excerpt:
"Is it true that every artist has one clearly identifiable, characteristic style that can be picked up by this technology?" wonders Ellen Handy, an art historian at the City College of New York. "Can artists really be resolved to a single pattern?"