R. Oinarov, “Boundedness of integral operators from weighted Sobolev space to weighted Lebesgue space”, Complex Var. Elliptic Eq., 56 (2011), 1021–1038
S. P. Eveson, V. D. Stepanov, E. P. Ushakova, “A duality principle in weighted Sobolev spaces on the real line”, Math. Nachr., 2015