000 00321nam a2200133Ia 4500
008 220709s9999 xx 000 0 und d
082 _a621.076
245 0 _aSIGNALS & SYSTEMS : OBJECTIVE PRACTICE SETS : ELECTRONIC ENGINEERING
250 _a7
260 _bMADE EASY
260 _c2021
300 _a87
942 _cREF
999 _c80996
_d80996