“On amicus curiae and the participation of trade unions in appeals of unconstitutionality: Commentary to Order of the Constitucional Court 125/2022, of September 29. Concerning the action of unconstitutionality num. 2191-2022” (2023) Journal of the Cortes Generales, (115), pp. 453–492. doi:10.33426/rcg/2023/115/1761.