Approximation and Online Algorithms 19th International Workshop, WAOA 2021, Lisbon, Portugal, September 6–10, 2021, Revised Selected Papers Koenemann, Jochen Heftet / 2021 / Engelsk
Operations Research Proceedings 2014 Selected Papers of the Annual International Conference of the German Operations Research Society (GOR), RWTH Aachen University, Germany, September 2-5, 2014 Lübbecke, Marco Heftet / 2016 / Engelsk
griechische Tyrannis - Die Tyrannis in archaischer Zeit Peisistratos (561/60; 545/540 - 528/527) Duvelmeyer, Britta Heftet / 2008 / Tysk