Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1971__2_133830, author = {K.K. Butler}, title = {On {Kim's} conjecture.}, journal = {Semigroup forum}, pages = {281--281}, publisher = {mathdoc}, volume = {2}, year = {1971}, zbl = {0232.20125}, url = {https://geodesic-test.mathdoc.fr/item/SF_1971__2_133830/} }
K.K. Butler. On Kim's conjecture.. Semigroup forum, Tome 2 (1971), p. 281. https://geodesic-test.mathdoc.fr/item/SF_1971__2_133830/