Friedrich-Schiller-University Jena, Institute of Computer Science, Ernst-Abbe-Platz 2, 07743 Jena, Germany.|Friedrich-Schiller-University Jena, Institute of Computer Science, Ernst-Abbe-Platz 2, 07743 Jena, Germany.|Friedrich-Schiller-University Jena, Institute of Computer Science, Ernst-Abbe-Platz 2, 07743 Jena, Germany.