@Article{ Espín_Brañas-Garza_HERRMANN_GAMELLA:4923-4928,

author = { Antonio M. Espín and Pablo Brañas-Garza and BENEDIKT HERRMANN and JUAN FRANCISCO GAMELLA MORA } ,

title = { Patient and Impatient punishers of free-riders },

year = { 2012 },

volume = { 279 },

pages = { 4923-4928 },

}