References
Rodin Yu.L.: The Riemann Boundary Problem on Riemann Surfaces, D. Reidel Publ. Co., Dordrecht (1988)
Filimonova I.I.: Some properties of operators T and P on finite Riemann surfaces, Uchenie Zapiski Permskogo Universiteta,22, No. 2 (1962) 65–82 (Russian)
Abdulaeva I.I.: About the unitarity of one singular operator on a closed Riemann surface, Trudi Tbilissskogo Mathematicheskogo Instituta63, (1978), 11–19 (Russian)
Zakharov V.E., Manakov S.V., Novikov S.P., Pitaevsky L.P.: Soliton Theory. The Inverse Problem Method Plenum Press NY (1984)