Difference independence of the Riemann zeta function Yik-Man Chiang; Shao-Ji Feng — 2006 Acta Arithmetica
On a problem in complex oscillation theory of periodic second order linear differential equations and some related perturbation results. Chiang, Yik-Man; Gao, Shi-An — 2002 Annales Academiae Scientiarum Fennicae. Mathematica