Perez P, Burn S (2010) Co-engineering participatory 
water management processes: theory and insights from Australian and Bulgarian interventions. Ecology and Society 15(4):11 
http://www.ecologyandsociety.org/vol15/iss4/art11
Eriksson  
L, Garvill J, Nordlund AM (2006). Acceptability of travel demand management measures: The importance of problem awareness, personal norm, 
freedom, and fairness
        
/media/vedurstofan/PhD_course-Programme_26Aug2011-final.pdf