groetschel@bbaw.de
harald.hanche-olsen@ntnu.no
helge.holden@ntnu.no
Michael.Krystek@ptb.de
© 2022 Martin Grötschel, Harald Hanche-Olsen, Helge Holden, Michael P. Krystek, published by Slovak Academy of Sciences, Mathematical InstituteThis work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.