[1] Wu Zi Qian, Discrete Algebraic Equations and Discrete Operator Equations, ICM 2010, ABSTRACTS,short communication,posters,285-285, http://www.icm2010.in/wp-content/icmfiles/abstracts/Contributed-Abstracts-5July2010.pdf.

[2] Wu Zi Qian,Composite and inverse of multivariate functions and algebraic system of equations.arXiv:1605.03430V2