Kalinina, N. V., A. V. Solovyova, T. A. Popova, I. D. Levina, L. N. Gorbunova, and S. Ignatov. “A Phenomenon of Hardiness As an Integral Feature of Personal Potential”. Cypriot Journal of Educational Sciences, vol. 15, no. 5, Oct. 2020, pp. 1354-67, doi:10.18844/cjes.v15i5.5175.