TY  - BOOK
AU  - Thomson, J
AU  - Turk, W.E
AU  - Beesley, M. J
TI  - Frequency conversion, parts I, II (and) III
AV  - TK 6564.F7 Fre 
PY  - 1969///
CY  - London
PB  - Wykeham Publications
ER  -