2 citations to https://www.mathnet.ru/rus/rm430

1. S. M. Natanzon, “Effectivisation of a string solution of the $2D$ Toda hierarchy and the Riemann theorem about complex domains”, Mosc. Math. J., 3:2 (2003), 541–549          
2. Natanzon, SM, “Formal series for the tau-function realizing Riemann's theorem about domains in the complex plane (vol 56, pg 760, 2001)”, Russian Mathematical Surveys, 56:5 (2001), 1017