1. Note on a theorem of Hilbert concerning series of positive terms;Hardy;Proc. Lond. Math. Soc.,1925
2. Bernerkungen sur Theorie der beschrankten Billnearformen mit unendlich vielen Veranderlichen;Schur;J. Math.,1911
3. Inequalities;Hardy,1934
4. Inequalities Involving Functions and Their Integrals and Deivatives;Mitrinović,1991
5. On Hilbert’s integral inequality;Yang;J. Math. Anal. Appl.,1998