M. de Berg. FSTTCS 2005: Foundations of Software Technology and Theoretical Computer Science, 25th International Conference, Hyderabad, India, December 15-18, 2005, Proceedings, том 3821 из Lecture Notes in Computer Science, стр. 116--127. Springer, (2005)
E. Ezra, и M. Sharir. FOCS '07: Proceedings of the 48th Annual IEEE Symposium on Foundations of Computer Science, стр. 525―535. Washington, DC, USA, IEEE Computer Society, (2007)