Luong, N.
(2006).
 Sharpening  mean - form  and  cyclic  inequality.
<em>VNU Journal Of Science: Mathematics - Physics, 22</em>(4).
Retrieved from <a href="https://js.vnu.edu.vn/MaP/article/view/2804" target="_new">https://js.vnu.edu.vn/MaP/article/view/2804</a>