Journal of Automata, Languages and Combinatorics formerly:
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@article{jalc190115, author = {Alberto Leporati and Giancarlo Mauri and Antonio E. Porreca and Claudio Zandron}, title = {A Gap in the Space Hierarchy of P Systems with Active Membranes}, journal = jalc, year = 2014, volume = 19, number = {1--4}, pages = {173--184} }