@article { pacheco15, journal = {PLoS Computational Biology}, keywords = {Miscellaneous;Game Theory;}, number = {2}, pages = {e1004101}, title = {Co-evolutionary Dynamics of Collective Action with Signaling for a Quorum}, volume = {11}, year = {2015}, author = {Jorge M. Pacheco and VĂ­tor V. Vasconcelos and Francisco C. Santos and Brian Skyrms} }