O. Maslovskaya, G. Chang, S. Howe, E. Aizpurua, and B. Perelli-Harris, “Effectiveness of Using Quick Response (QR) Codes in Survey Invitation Letters: Experiment Conducted in Generations and Gender Survey in the UK”, SRM, vol. 20, no. 3, pp. 359–367, Oct. 2026, doi: 10.18148/srm/2026.v20i3.8522.