TY  - BOOK
AU  - Helszajn,J..
TI  - Waveguide junction circulators: theory and practice 
SN  - 0471982520
AV  - TK7871.65  .H44 1998
PY  - 1998///
CY  - Chichester
PB  - John Wiley
KW  - Circulators, Wave-guide
ER  -