2022. Speech by José Echegaray in the National Assembly on 8 March 1873 (Journal of Sessions of the National Assembly number 19): (Accompanied by a commentary by Alejandro Nieto from his book “La Primera República Española”). Journal of the Cortes Generales. 112 (Jun. 2022), 19–41. DOI:https://doi.org/10.33426/rcg/2022/112/1655.