TY  - BOOK
AU  - Helszajn, Joseph
ED  - Institution of Electrical Engineers
TI  - Ridge Waveguides and Passive Microwave Components 
SN  - 0852967942
U1  - 621.381331 
PY  - 2000///
CY  - London : 
PB  - Institution of Electrical Engineers, 
KW  - Waveguides
N1  - NY
UR  - https://eaklibrary.neduet.edu.pk:8443/catalog/bk/books/toc/0-85296-794-2.pdf
ER  -