D. Benz, A. Hotho, R. Jäschke, G. Stumme, A. Halle, A. Lima, H. Steenweg, и S. Stefani. Proceedings of the European Conference on Research and Advanced Technology for Digital Libraries (ECDL) 2010, том 6273 из Lecture Notes in Computer Science, стр. 417--420. Berlin/Heidelberg, Springer, (2010)
D. Benz, A. Hotho, R. Jäschke, G. Stumme, A. Halle, A. Lima, H. Steenweg, и S. Stefani. Proceedings of the European Conference on Research and Advanced Technology for Digital Libraries (ECDL) 2010, том 6273 из Lecture Notes in Computer Science, стр. 417--420. Berlin/Heidelberg, Springer, (2010)