“Have alternative social security mutualities to the RETA reached their lowest point? The mandatory inclusion of self-employed professional groups in the RETA ‘system’ is seen as a logical step within the overall Social Security framework” (2024) Revista de Derecho de la Seguridad Social, Laborum, (39), pp. 13–32. Available at: https://revista.laborum.es/index.php/revsegsoc/article/view/971 (Accessed: 6 November 2026).