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@book{BERE10, author = {Berstel, Jean and Reutenauer, Christophe}, doi = {10.1017/CBO9780511760860}, isbn = {0521190223,9780521190220,9780511760860}, publisher = {Cambridge University Press}, series = {Encyclopedia of Mathematics and its Applications}, sha256 = {0A4B61814201B20ABA0D4B37251CAF334AB1B95B67D6BB06FFC8B23582290B12}, title = {Noncommutative rational series with applications}, volume = {137}, year = {2010} }