Nachum Dershowitz Claude Kirchner SPREADSPACES: Mathematically-Intelligent Graphical Spreadsheets. 194-208 2008 Concurrency, Graphs and Models http://dx.doi.org/10.1007/978-3-540-68679-8_13 conf/birthday/2008montanari db/conf/birthday/montanari2008.html#DershowitzK08