@misc{150636, author = {Daniel Raviv}, title = {Invariants in Visual Motion}, year = {1991}, month = {1991-11-01}, publisher = {NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD}, url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=820367}, language = {en}, }