TY  - RPRT
TI  - A modern frequency and phase indicating toposcope.
AU  - H W Shipton
AU  - G L Armstrong
PY  - 1981
DO  - 10.1016/0013-4694(81)91442-5
UR  - https://pubmed.ncbi.nlm.nih.gov/6172267/
ID  - 6172267
ER  -