TY  - BOOK
AU  - Helszajn,J
TI  - Microwave planar passive circuits and filters
SN  - 0471940569
U1  - 621.381 5 
PY  - 1994///
CY  - New York
PB  - John Wiley
KW  - microwave circuits
KW  - microwave planar
ER  -