“Objection of Administrative Sanction Imposed by the Council of Ministers for Lack of Income from Social Security Contributions: Sanctioning Type and Exculpatory Causes of Responsibility. Comment to the STS (social) No. 969 2018, of November 20 (objection of Acts of the Administration No. 2 2018)”. Revista de Derecho de la Seguridad Social, Laborum, no. 21, Dec. 2019, pp. 115-33, https://revista.laborum.es/index.php/revsegsoc/article/view/381.