1. Lecture notes in Math;A Aikawa,1996
2. Azzouz, N., Halim, B., Senouci, A.: An inequality for the weighted Hardy operator for $$0 \,< \,p \,< \,1$$. Euraisan Math. J. 4(3), 60–65 (2013). (ISSN. 2077-9879)
3. Azzouz, N., Burenkov, V.I., Senouci, A.: A weighted Hardy-type inequality for $$0\, <\, p\, <\, 1$$ with sharp constant. M.I.A. 18(2), 787–799 (2015)
4. Hardy, G.H.: Note on a theorem of Hilbert. Math. Z. 6, 314–317 (1920)
5. Jichang, K.: Applied Inegalities. Hunan Education Press, Changsha (1992)