refer to
[1] Pei Liwen. Research on Typical Problems and Methods in Mathematical Analysis (2nd Edition) [M]. Beijing: Higher Education Press, 2006.
[2] Chen Jixiu, etc. Mathematical Analysis Second Edition [M]. Beijing: Higher Education Press, 2004.5
Zhai, Yao Zhengan. Methodology of mathematical analysis [M]. Beijing: Beijing Agricultural University Press, 1992
[4] Gong Dongbao. Typical solutions, skills and matters needing attention in advanced mathematics [M]. Xi An: Xi Jiaotong University Press, 2000.
[5] Guo Qiao. How to solve problems with auxiliary functions [J]. Advanced Mathematics Research, 2002.3 (5), 48- 49.
[6] Patrick fitzpatrick. Advanced Calculus: A Course of Mathematical Analysis [M]. Beijing: China Industry Press, 2003.
[7] Lin Yuanhua. On the Function of Auxiliary Function in Mathematical Analysis [J]. Journal of Hechi Teachers College, 2000+02.
[8] Xiaoping Exploration on the construction method of auxiliary function. Journal of Xichang Teachers College [J], 2002.9.
For reference.