- Michael Reissig, Alexei Timofeev, “Dirichlet problems for generalized Cauchy–Riemann systems with singular coefficients”, Complex Variables, Theory and Application: An International Journal, 50, № 7-11, 2005,
653 
- G. Giorgadze, V. Jikia, G. Makatsaria, “Singular Generalized Analytic Functions”, J Math Sci, 237, № 1, 2019,
30