“Passive Class and Ordinary Widowhood Pension: Winds of Change on Construction of Proof of Cohabitation Antecedent to the Marriage”. Revista de Derecho de la Seguridad Social, Laborum, no. 8 (July 8, 2016). Accessed May 20, 2024. https://revista.laborum.es/index.php/revsegsoc/article/view/115.