000 00286nam a2200121Ia 4500
008 211209s1978 xx 000 0 und d
041 _aeng
082 _a621.381 32 N78 HEL
100 _aHELSZAJN J
245 _aPASSIVE AND ACTIVE MICROWAVE CIRCUITS
260 _c1978
300 _a274
999 _c15893
_d15893