1. G. Akhalaia, G. Giorgadze, V. Jikia, N. Kaldani, N. Manjavidze, G. Makatsaria, Elliptic systems on Riemann surfaces. Lecture Notes of TICMI, vol. 13, pp. 1–147. Tbilisi University Press, Tbilisi (2012)
2. A.A. Belavin, V.G. Knizhnik, Complex geometry and the theory of quantum strings. Sov. Phys. JETP 64, 22–43 (1986)
3. L. Bers, Theory of Pseudo-analytic Functions (Courant Institute, New York, 1953)
4. B. Bojarski, On a boundary value problem for a system of elliptic equations. Dokl. Akad. Nauk SSSR (N.S.) 102, 201–204 (1955)
5. B. Bojarski, G. Giorgadze, Some analytical and geometric aspects of the stable partial indices, Proceedings of the I.Vekua Institute of Applied Mathematics, vol. 61–62 (2011–2012), pp. 14–32