Limiting case of the boundedness of fractional integral operators on nonhomogeneous space. Sawano, Yoshihiro; Sobukawa, Takuya; Tanaka, Hitoshi — 2006 Journal of Inequalities and Applications [electronic only]
Extrapolation theorem on Lp spaces over infinite measure space: An approach p → p. Takuya Sobukawa — 1997 Collectanea Mathematica