Allvin, M., C. Mellner, F. Movitz, and G. Aronsson. “The Diffusion of Flexibility: Estimating the Incidence of Low-Regulated Working Conditions”. Nordic Journal of Working Life Studies, Vol. 3, no. 3, Sept. 2013, pp. 99-116, doi:10.19154/njwls.v3i3.3013.