中国科学院数学与系统科学研究院期刊网
AMS
Exponential Polynomials as Solutions of Certain Nonlinear Difference Equations
Zhi Tao, WEN Janne, HEITTOKANGAS, Ilpo LAINE
Acta Mathematica Sinica . 2012, (7): 1295 -1306 .  DOI: 10.1007/s10114-012-1484-2