Dütting, P., Henzinger, M. H., &; Weber, I. (2010). Sponsored search, market equilibria, and the Hungarian Method. In 27th International Symposium on Theoretical Aspects of Computer Science (Vol. 5, pp. 287–298). Nancy, France: Schloss Dagstuhl - Leibniz-Zentrum für Informatik.https://doi.org/10.4230/LIPICS.STACS.2010.2463 

Baykan,https://doi.org/10.4230/LIPICS.STACS.2009.1809__Eda, Henzinger, M. H., Keller, S. F., de Castelberg, S., &; Kinzler, M. (2009). A comparison of techniques for sampling web pages. In 26th International Symposium on Theoretical Aspects of Computer Science (Vol. 3, pp. 13–30). Freiburg, Germany: Schloss Dagstuhl - Leibniz-Zentrum für Informatik.https://doi.org/10.4230/LIPICS.STACS.2009.1809