Object Oriented Ltd, 6004 Luzern, Switzerland, Department of Computer Science and Department of Ecology and Genetics, University of Aarhus, 8000 Aarhus C, Denmark.|Object Oriented Ltd, 6004 Luzern, Switzerland, Department of Computer Science and Department of Ecology and Genetics, University of Aarhus, 8000 Aarhus C, Denmark.|Object Oriented Ltd, 6004 Luzern, Switzerland, Department of Computer Science and Department of Ecology and Genetics, University of Aarhus, 8000 Aarhus C, Denmark.