Kossar, Lorena Mainardes, and Rafaela Mattioli Somma. “Application of the Principle of Territoriality to the Spatial Criterion of Service Tax - ISS”. Revista Do Direito Público, vol. 3, no. 1, July 2008, pp. 80-89, doi:10.5433/1980-511X.2008v3n1p80.