1. Arabadzhieva, M., Vutsova, A. (2019) Social enterprises: successful or/and disputable actor in the field of eco-innovation system, Bulgarian case. European Public & Social Innovation Review, vol. 4, Nº 2, pp. 25-43. Retrieved from: https://pub.sinnergiak.org/esir/article/view/111.
2. Asenova, D.; Damianova, Z. (2017) Social innovation – an emerging concept in Eastern Europe. Retrieved from: https://www.socialinnovationatlas.net/fileadmin/PDF/einzeln/02_SI-in-World-Regions/02_08_SI_Emerging-Concept-in_Eastern-Europe_Asenova-Damianova.pdf.
3. Asmalovskij, A., Sadílek, T., Hinčica, V., Mizerová, M. (2018) Performance of Social Enterprises in the Czech Republic, Journal of Social Entrepreneurship, Retrieved from: https://doi.org/10.1080/19420676.2018.1521865.
4. Boelman, V.; Heales, C. (2015) Social innovation strategies regional report D3.6. Retrieved from: http://www.si-drive.eu/wp-content/uploads/2018/03/D3.6-SI-DRIVE-Global-Region-Report-2015.pdf
5. BRITISH COUNCIL (2017) Greece Social and Solidarity Economy Report. https://www.britishcouncil.org/sites/default/files/greece_social_and_solidarity_economy_report_greek_british_council.pdf.