Zuiderent-Jerak, T., and S. van Egmond. “Ineffable Cultures or Material Devices: What Valuation Studies Can Learn from the Disappearance of Ensured Solidarity in a Health Care Market”. Valuation Studies, vol. 3, no. 1, Oct. 2015, pp. 45-73, doi:10.3384/VS.2001-559.153145.