TY  - RPRT
TI  - Modeling simple-cell direction selectivity with normalized, half-squared, linear operators.
AU  - D J Heeger
PY  - 1993
DO  - 10.1152/jn.1993.70.5.1885
UR  - https://pubmed.ncbi.nlm.nih.gov/8294961/
ID  - 8294961
ER  -