Khayrullina, Y. R., Eflova, M. Y., Garipova, R. R., & Yamilov, E. R. (2018). The problems of development of small business: the experience of empirical research (based on the materials of the Republic of Tatarstan). Amazonia Investiga, 7(17), 406–413. Retrieved from https://amazoniainvestiga.info/index.php/amazonia/article/view/755