000			00346nam a2200157Ia 4500
008			190201s9999 xx 000 0 und d
020			_a9.78E+12
082			_a621
082			_b380413
100			_a"Purser,Michael"
245		0	_aComputers And Telecommun
260			_aLondon
260			_bBlackwell
260			_c1987
300			_aVIII- 323
999			_c30447 _d30447