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Link to original content: https://dblp.org/rec/journals/ipl/BerstelB87.xml
Jean Berstel Srecko Brlek On the Length of Word Chains. 23-28 1987 26 Inf. Process. Lett. 1 db/journals/ipl/ipl26.html#BerstelB87 https://doi.org/10.1016/0020-0190(87)90031-7