@Article{GRV-wsl-07, author = {Geeraerts, G. and Raskin, J.-F. and {Van~Begin}, L.}, title = {{W}ell-{S}tructured {L}anguages}}, journal = {Acta Informatica}, year = {2007}, volume = {44}, number = {3-4}, pages = {249--288}, }