On the zeros and hyper-order of meromorphic solutions of linear differential equations. Chen, Zongxuan; Yang, Chungchun — 1999 Annales Academiae Scientiarum Fennicae. Mathematica
Growth of solutions of complex differential equations with coefficients of finite iterated order. Tu, Jin; Chen, Zongxuan; Zheng, Xiumin — 2006 Electronic Journal of Differential Equations (EJDE) [electronic only]