TY  - RPRT
TI  - AN INEXPENSIVE DIGITAL STOP-CLOCK.
AU  - J SPENCER
PY  - 1965
DO  - 10.1111/j.2044-8295.1965.tb00975.x
UR  - https://pubmed.ncbi.nlm.nih.gov/14340134/
ID  - 14340134
ER  -