Till Mossakowski Ugo Montanari Magne Haveraaen Algebra and Coalgebra in Computer Science, Second International Conference, CALCO 2007, Bergen, Norway, August 20-24, 2007, Proceedings CALCO Lecture Notes in Computer Science 4624 Springer 2007 978-3-540-73857-2 db/conf/calco/calco2007.html