The UDC Summary of around 2,000 classes has been online since October 2009 and can now be browsed in 10 languages here.
The UDC summary is fully aligned with the UDC MRF 2009 which is going to be released in the following months.This set is made available for free use under the Creative Commons Attribution Share Alike 3.0 license (CC-BY-SA).
B. Kessler, G. Numberg, and H. Schütze. ACL-35: Proceedings of the 35th Annual Meeting of the Association for Computational Linguistics and Eighth Conference of the European Chapter of the Association for Computational Linguistics, page 32--38. Morristown, NJ, USA, Association for Computational Linguistics, (1997)
S. Banerjee. ICMLA '07: Proceedings of the Sixth International Conference on Machine Learning and Applications (ICMLA 2007), page 148--153. Washington, DC, USA, IEEE Computer Society, (2007)