The Leuven Perceptual Organization Screening Test (L-POST), an online test to assess mid-level visual perception
Behavior Research Methods (2014) - Comment
pubmed: 24190065  doi: 10.3758/s13428-013-0382-6  issn: 1554-3528 

Katrien Torfs, Kathleen Vancleef, Christophe Lafosse, Johan Wagemans, Lee De-Wit