Ülviste, A.M., Suurorg, K., Balõtšev, R., Padrik, M. and Peek, T. 2025. Identifying communication difficulties in early childhood: Validation of the FOCUS questionnaire. Eesti Haridusteaduste Ajakiri. Estonian Journal of Education. 13, 2 (Oct. 2025), 134–162. DOI:https://doi.org/10.12697/eha.2025.13.2.06.