Matraeva, Liliia V, Alexey A. Konov, Alexey V. Belyak, Sergey G. Erokhin, and Ekaterina S. Vasyutina. 2016. “Public Private Partnership in Social Sphere: Models Review”. International Journal of Economics and Financial Issues 6 (8S):127-36. https://econjournals.com.tr/index.php/ijefi/article/view/3718.