Attention is drawn to an error in W. S. Jassim's paper.
@article{urn:eudml:doc:38771, title = {Erratum: W. S. Jassim, On the intersection of finitely generated subgroups of free groups, Rev. Mat. Univ. Compl. 9(1996), 67-84.}, journal = {Revista Matem\'atica de la Universidad Complutense de Madrid}, volume = {11}, year = {1998}, pages = {263-265}, mrnumber = {MR1666469}, zbl = {0884.20016}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:38771} }
Dicks, Warren. Erratum: W. S. Jassim, On the intersection of finitely generated subgroups of free groups, Rev. Mat. Univ. Compl. 9(1996), 67-84.. Revista Matemática de la Universidad Complutense de Madrid, Tome 11 (1998) pp. 263-265. http://gdmltest.u-ga.fr/item/urn:eudml:doc:38771/