@conference {219, title = {A general approach for qualitative reasoning models based on intervals}, booktitle = {VIII Jornadas ARCA. Razonamiento Cualitativo y Aplicaciones. Rob{\'o}tica, Econom{\'\i}a, Diagnosis y Clasificaci{\'o}n}, year = {2006}, address = {Pe{\~n}{\'\i}scola, Spain}, isbn = {84-611-1401-9}, author = {Ester Martinez-Martin and M.T. Escrig} }