Journal of Automata, Languages and Combinatorics formerly:
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@article{jalc090104, author = {Giovanna Guaiana and Antonio Restivo and Sergio Salemi}, title = {On the Trace Product and some Families of Languages Closed under Partial Commutations}, journal = jalc, year = 2004, volume = 9, number = 1, pages = {61--79} }