M. Kraepelien, Blom, K., Forsell, E., Isacsson, N. Hentati, Bjurner, P., Morin, C. M., Jernelöv, S., and Kaldo, V.,
“A very brief self-report scale for measuring insomnia severity using two items from the Insomnia Severity Index - development and validation in a clinical population.”,
Sleep Med, vol. 81, pp. 365-374, 2021.