000			00334nam a2200157Ia 4500
008			190201s9999 xx 000 0 und d
020			_a273361562
082			_a621
082			_b38 S93
100			_a"Seymour,J"
245		0	_aPhysical Electronics
260			_aLondon
260			_bPitman
260			_c1972
300			_aVII- 438
999			_c23261 _d23261