Lin Han, Edwin R. Hancock, Richard C. Wilson. Characterizing Graphs Using Approximate von Neumann Entropy. In Jordi Vitrià, João Miguel Raposo Sanches, Mario Hernández, editors, Pattern Recognition and Image Analysis - 5th Iberian Conference, IbPRIA 2011, Las Palmas de Gran Canaria, Spain, June 8-10, 2011. Proceedings. Volume 6669 of Lecture Notes in Computer Science, pages 484-491, Springer, 2011. [doi]