000			00411nam a2200133Ia 4500
008			180413s9999 xx 000 0 und d
020			_a262121123
100			_aLiskov B
245		0	_aAbstraction And Specification In Program Development Barbara Liskov And John Guttag
260			_bCambridge Mass. : Mit Press New York : Mcgraw-Hill C1986.
300			_a469
546			_aEng
690			_aComputer Programming.
999			_c39388 _d39388