Deprecated function: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in content_access_get_settings() (line 225 of modules/contrib/content_access/content_access.module).
Johanisova, N., R.S. Padilla, P. Parry. 2015. Co-operatives. In D´Alisa, G., F. Demaria, G.Kallis. Degrowth: Vocabulary for a New Era. London: Routledge, p- 152 - 155