Gutlyanskii, V., Ryazanov, V., Yakubov, E. ja Yefimushkin, A. 2020. On Hilbert boundary value problem for Beltrami equation. Annales Fennici Mathematici. 45, 2 (elo 2020), 957–973. DOI:https://doi.org/10.5186/aasfm.2020.4552.