- Meiirkhan B. Borikhanov, Batirkhan Kh. Turmetov, 1759, 2016,
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- Roberto Garra, Enzo Orsingher, Federico Polito, “A Note on Hadamard Fractional Differential Equations with Varying Coefficients and Their Applications in Probability”, Mathematics, 6, no. 1, 2018,
4 - Batirkhan Kh. Turmetov, 1880, 2017,
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