[1] Hsieh P. F.:
Successive approximations method for solutions of nonlinear differential equations at irregular type singular point. Comment. Math. St. Pauli, 20 (1971), 27-53.
MR 0296378
[2] Hsieh P. F.:
Analytic simplification of a system of ordinary differential equations at an irregular type singularity. ibid. 20 (1971), 55-82.
MR 0296379 |
Zbl 0258.34005
[3] Hsieh P. F.:
A general solution of a system of nonlinear differential equations at an irregular type singularity. Funk. Ekv. 16 (1973), 103-136.
MR 0330577 |
Zbl 0331.34011
[4] Iwano M.:
Analytic expressions for bounded solutions of nonlinear ordinary differential equations with an irregular type singular point. Ann. Mat. Pura Appl. (4), 82 (1969), 189-256.
MR 0251284