@inproceedings{pirkwieser-09a,
 address = {Hamburg, Germany},
 author = {Sandro Pirkwieser and Günther~R. Raidl},
 booktitle = {Proceedings of the 8th Metaheuristic International Conference},
 editor = {Stefan Voss and Marco Caserta},
 keywords = {hybrid},
 title = {Boosting a Variable Neighborhood Search for the Periodic Vehicle Routing Problem with Time Windows by {ILP} Techniques},
 url = {https://www.ac.tuwien.ac.at/files/pub/pirkwieser-09a.pdf},
 year = {2009}
}