[size=100][size=200][color=#000000]The [b]KUMULATOR [/b]will be published Dec. 2016.[br][br]Elschenbroich, H.-J. & Seebach, G. (2016): [br]Modellieren mit dem KUMULATOR. [br][/color][b][color=#000000]mathematik lehren 199.[/color][br][/b][br][color=#0000ff][u]elschenbroich@t-online.de [/u][/color][/size][/size]