Ospanov, K., Z. Yeskabylova, and D. Beisenova. “Maximal Regularity Estimates for Higher Order Differential Equations With Fluctuating Coefficients”. Eurasian Mathematical Journal, vol. 10, no. 2, June 2019, pp. 65-74, doi:10.32523/2077-9879-2019-10-2-65-74.