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@article{SF_1989__39_2_134999, author = {S. Zhang}, title = {A note on r-extensible prefix codes.}, journal = {Semigroup forum}, pages = {377--380}, publisher = {mathdoc}, volume = {39}, number = {2}, year = {1989}, zbl = {0663.20068}, url = {http://geodesic.mathdoc.fr/item/SF_1989__39_2_134999/} }
S. Zhang. A note on r-extensible prefix codes.. Semigroup forum, Tome 39 (1989) no. 2, pp. 377-380. http://geodesic.mathdoc.fr/item/SF_1989__39_2_134999/