Kovalyov, I. et al. 2021. $\alpha-$regular indefinite Stieltjes moment problem and Darboux transformation. Methods of Functional Analysis and Topology. 27, 4 (Dec. 2021), 353–369. DOI:https://doi.org/https://doi.org/10.31392/MFAT-npu26_4.2021.09.