1. Yu. A. Mitropol'skii and B. I. Moseenkov,Asymptotic Solutions of Partial Differential Equations [in Russian], Vyshcha Shkola, Kiev (1976).
2. B. I. Sokil and A. F. Barvins'kyi, “On the asymptotic solution of a nonlinear boundary-value problem,”Dop. Akad. Nauk Ukr. RSR, Ser. A, No. 1, 22–26 (1980).
3. P. M. Senik, “Inversion of an incomplete beta-function,”Ukr. Mat. Zh. 21 No. 3, 325–333 (1969).