1. Informe Anual de Recaudación Tributaria, 1994;AEAT,1995
2. Closing the gap between the 1990 deposition and the critical sulfur deposition values;Amman,1993
3. Using critical loads to determine relative prices in an emissions trading scheme;ApSimon,1992
4. Boletin Estadistico;Banco de España,1995
5. General equilibrium computations of the marginal welfare costs of taxes in the United States;Ballard;American Economic Review,1985