Facchin, A.; Giordano, L.; Brebbia, G.; Maffioletti, S. Application, Limits, Scoring and Improvements of Groffman Visual Tracing Test. Scand J Optom Vis Sci 2020, 13 (1), 2-9. https://doi.org/10.5384/sjovs.vol13i1p2-9.