TY  - RPRT
TI  - Padding point extrapolation techniques for the Butterworth digital filter.
AU  - G Smith
PY  - 1989
DO  - 10.1016/0021-9290(89)90082-1
UR  - https://pubmed.ncbi.nlm.nih.gov/2613731/
ID  - 2613731
ER  -