RT Journal T1 ON THE BOUNDS OF THE PERIMETER OF AN ELLIPSE A1 Tiehong ZHAO, Miaokun WANG, Yuming CHU PB Acta mathematica scientia,Series B FD 2022-04-25 YR 2022 JF Acta mathematica scientia, Series B JO Acta mathematica scientia,Series B VO 42 IS 2 SP 491 DO 10.1007/s10473-022-0204-y K1 Gaussian hypergeometric function;complete elliptic integral;ellipse;perimeter LK {http://121.43.60.238/sxwlxbB/EN/article/article_16665.shtml}