title = {Teaching CAD in an architectural school with the SIGMA-ARCHI system.},
author = {B. David and F. Zanelli and François-Joseph Z'Graggen}, journal = {Computers & Graphics}, number = {3-4}, pages = {193-199}, url = {http://dblp.uni-trier.de/db/journals/cg/cg4.html#DavidZZ79}, volume = {4}, year = {1979}, description = {dblp}, ee = {http://dx.doi.org/10.1016/0097-8493(79)90022-0}, date = {2005-11-03},
keywords = {dblp }
::