%% -*-BibTeX-*- @InCollection{Groetschel2015a, author = "Martin Gr{\"o}tschel", editor = "Stephan Hu{\ss}mann and Brigitte Lutz-Westphal", booktitle = "Diskrete Mathematik erleben", title = "Schnelle Rundreisen: Das Travelling-Salesman-Problem", chapter = "4", publisher = "Springer Sepktrum", address = "Wiesbaden", pages = "95--128", year = "2015", ISBN = "978-3-658-06992-6", URL = "http://www.springer.com/springer+spektrum/mathematik/book/978-3-658-06992-6", classmath = "00A35 97C70", language = "German",