TY  - RPRT
TI  - Null functions and eigenfunctions: tools for the analysis of imaging systems.
AU  - H H Barrett
AU  - J N Aarsvold
AU  - T J Roney
PY  - 1991
UR  - https://pubmed.ncbi.nlm.nih.gov/1988975/
ID  - 1988975
ER  -