- D A Tverdyi, R I Parovik, “Fractional Riccati equation to model the dynamics of COVID-19 coronovirus infection”, J. Phys.: Conf. Ser., 2094, no. 3, 2021,
032042 
- Dmitriy Tverdyi, Roman Parovik, “Investigation of Finite-Difference Schemes for the Numerical Solution of a Fractional Nonlinear Equation”, Fractal Fract, 6, no. 1, 2021,
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