Vellón Lahoz, F. J. “The Relative Clauses Without Antecedent in the 18th and 19th Centuries: Variation and Contexts of Use”. Cuadernos De Lingüística De El Colegio De México (CLECM), vol. 7, Nov. 2020, pp. 1-54, doi:10.24201/clecm.v7i0.196.