TY  - RPRT
TI  - ON THE ABSOLUTE STABILITY OF SAMPLED-DATA CONTROL SYSTEMS.
AU  - G P Szegö
PY  - 1963
DO  - 10.1073/pnas.50.3.558
UR  - https://pubmed.ncbi.nlm.nih.gov/16578547/
ID  - 16578547
ER  -