@article {2092, title = {Restricted Polarizationless P Systems with Active Membranes: Minimal Cooperation Only Inwards}, journal = {Fifteenth Brainstorming Week on Membrane Computing (BWMC2017)}, year = {2017}, publisher = {F{\'e}nix Editora}, url = {http://www.gcn.us.es/15bwmc_proceedings}, author = {Luis Valencia-Cabrera and David Orellana-Mart{\'\i}n and Miguel A. Mart{\'\i}nez-del-Amor and Agust{\'\i}n Riscos-N{\'u}{\~n}ez and Mario J. P{\'e}rez-Jim{\'e}nez} }