Journal of Automata, Languages and Combinatorics formerly:
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@article{jalc060302, author = {Denecke, Klaus and Koppitz, J\"{o}rg and Shtrakov, Slavcho}, title = {The Depth of a Hypersubstitution}, journal = jalc, year = 2001, volume = 6, number = 3, pages = {253--262} }