O. Stefan, M. Avbelj, M. Eliantonio, M. Hartlapp, E. Korkea-aho, N. Rubio,
O. Stefan M. Avbelj M. Eliantonio, M. Hartlapp, E. Korkea-aho, N. Rubio, "EU Soft Law in the EU Legal Order: A Literature Review", 2017, 40 p. : https://www.solar-network.eu/wp-content/uploads/2017/06/SoLaR-A-Literature-Review-1.pdf