@misc{indiciae58db27e49e92, title = {Phi movement as a subtraction process.}, author = {S M Anstis}, year = {1970}, doi = {10.1016/0042-6989(70)90092-1}, url = {https://pubmed.ncbi.nlm.nih.gov/5516541/}, note = {Source identifier: 5516541} }