TY  - RPRT
TI  - LINEAR TRANSFORMATIONS IN HILBERT SPACE. I. GEOMETRICAL ASPECTS.
AU  - M H Stone
PY  - 1929
DO  - 10.1073/pnas.15.3.198
UR  - https://pubmed.ncbi.nlm.nih.gov/16577166/
ID  - 16577166
ER  -