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References:
[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
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