Vita Carvalho, Ana Emilia, Francisco Eulógio Martinez, and Maria Beatriz Martins Linhares. “Maternal anxiety and depression and development of prematurely born infants in the first year of life”. The Spanish Journal of Psychology, vol. 11, vol. 11, no. 2, 2008, pp. 600-8, https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0808220600A.