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Zernov, A.E. 2003. Qualitative Investigation of the Singular Cauchy Problem $\sum\limits_{k = 1}^n {(a_{k1} t + a_{k2} x)(x’)^k = b_1 t + b_2 x + f(t,x,x’),x(0) = 0}$. Ukrains’kyi Matematychnyi Zhurnal. 55, 10 (Oct. 2003), 1419-1424.