[ 3] HE Yu - zan, XIAO Xiu - zhi. Admissible Solutions of Ordinary Di fferential Equations[ J] . Contemporary Math. , 1983, 25: 51- 61.
[ 4] TODA N, KATO M. On Some Algebraic Differential Equations Wi th Admissible Algebraical Solutions[ J] . Proc. Japan Acad. , Ser. A. ,1985, 61: 325- 328.