TY  - JOUR
PY  - 1962//
TI  - A general gradient theory of spatial vision
JO  - Annals of the New York Academy of Sciences
A1  - Porter, Paul B.
SP  - 753
EP  - 759
VL  - 93
IS  - 17
N2  - <p>[Abstract unavailable]</p> <p>Language: en</p> 
LA  - en
SN  - 0077-8923
UR  - http://dx.doi.org/10.1111/j.1749-6632.1962.tb30505.x
ID  - ref1
ER  -