@Book{bbi92,
	author = 	{H. R. Hansen and  R. Mühlbacher and  G. Neumann},
	title = 	{Begriffsbasierte Integration von Systemanalysemethoden},
	year = 	{1992},
	month = 	{December},
	category = 	{EC, NM, data modeling, logic programming},
	publisher = 	{Physica Verlag},
}