%A Xiaojun HUANG %T REVISITING A NON-DEGENERACY PROPERTY FOR EXTREMAL MAPPINGS %0 Journal Article %D 2021 %J 数学物理学报(英文版) %R 10.1007/s10473-021-0602-6 %P 1829-1838 %V 41 %N 6 %U {http://121.43.60.238/sxwlxbB/CN/abstract/article_16569.shtml} %8 2021-12-25 %X We extend an earlier result obtained by the author in[7].