TY  - RPRT
TI  - TWO-WAY TELEPHONE SYSTEM FOR SEMINARS USING POST-OFFICE TRUNK LINES.
AU  - M BALINT
PY  - 1964
DO  - 10.1016/s0140-6736(64)92759-x
UR  - https://pubmed.ncbi.nlm.nih.gov/14219146/
ID  - 14219146
ER  -