TY  - RPRT
TI  - Method and apparatus for measuring frequency and phase difference
AU  - Kobayashi, Herbert S.
AU  - Lichtenberg, Christopher L.
AU  - Shores, Paul W.
AU  - Cunningham, Allen R.
PY  - 1989
UR  - https://ntrs.nasa.gov/citations/20080012361
ID  - 20080012361
ER  -