Dicks, Warren. 1998. «Erratum: W.5. Jassim, On the intersection of finitely generated subgroups of free groups, Rey. Mat. Univ. Compl.9 (1996), 67-84». Revista Matemática Complutense 11, nº 2:: 263. https://doi.org/10.5209/rev_REMA.1998.v11.n2.17238