9 Evelio Fernández, delegate; Santiago A. Canton, delegate; Lilly Ching, advisor; Marisol Blanchard, advisor, Martha Braga, advisor, and for the alleged victims: Pedro Nikken, representative; Carlos Ayala Corao, representative; Fernando Guier, representative, and for the Costa Rican State: Farid Beirute Brenes, agent; José Enrique Castro Marín, alternate agent, and Tatiana Gutiérrez Delgado, advisor; witnesses offered by the Inter-American Commission: Mauricio Herrera Ulloa, and Fernán Vargas Rohrmoser; expert witness offered by the Inter-American Commission: Rubén Hernández Valle; expert witness offered jointly by the Inter-American Commission and the alleged victims’ representatives: Carlos Tiffer Sotomayor; expert witness offered by the alleged victims’ representatives: Héctor Faúndez Ledesma; expert witnesses offered by the Costa Rican State: Federico Sosto López, and Luis Alberto Sáenz Zumbado. 51. Expert witness Rubén Hernández Valle and witnesses Mauricio Herrera Ulloa and Fernán Vargas Rohrmoser introduced a number of documents on the occasion of the public hearing on preliminary objections and possible merits, reparations and costs, held on April 30 and May 1, 2004. 52. On May 7, 2004, the Open Society Justice Initiative filed an amicus curiae brief. 53. On May 27 and 31 and June 2, 2004, the State, the alleged victims’ representatives and the Inter-American Commission, respectively, submitted their