Esparó G, Torrente M, Fernández-ballart JD, Canals J. Psychological problems and associated factors at 6 years of age: Differences between sexes. Span. j. psychol. [Internet]. 2004 Apr. 6 [cited 2026 Jul. 23];7(1):53-62. Available from: https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0404120053A