Ülviste, A. M., K. Suurorg, R. Balõtšev, M. Padrik, and T. Peek. “Identifying Communication Difficulties in Early Childhood: Validation of the FOCUS Questionnaire”. Eesti Haridusteaduste Ajakiri. Estonian Journal of Education, vol. 13, no. 2, Oct. 2025, pp. 134-62, doi:10.12697/eha.2025.13.2.06.