@inbook {189, title = {A general approach for qualitative reasoning models based on intervals}, booktitle = {Artificial Intelligence Research and Development}, year = {2006}, pages = {91{\textendash}102}, publisher = {IOS Press}, organization = {IOS Press}, chapter = {A general approach for qualitative reasoning models based on intervals}, isbn = {1-58603-663-7}, author = {Ester Martinez-Martin and M.T. Escrig} }