Dragomir , Silvestru Sever <br/><br/>
Riemann–Stieltjes Integral Inequalities for Complex Functions Defined on Unit Circle: with Applications to Unitary Operators in Hilbert Spaces 

 -  Taylor and Francis  2019 
<br/><br/><label>ISBN: </label>9780429326950 
<br/><br/><label>Source: </label>EBOOK