1. Bodnar D.I.: 1986, ‘Branched continued fractions,’ Naukova Dumka, Kiev (in Russian).
2. Jones W.B., Thron W.J.: 1980, ‘Continued fractions: analytic theory and applications’, Encyclopedia of Mathematics and its Applications, Addison-Wesley Publishing Company, Massachusets.
3. Kuchminskaya Kh.(Kuclunins’ka): 1984, ‘On sufficient conditions of convergence for two-dimensional continued fractions’,Mat. Melody i Fiz.-Meh. Polya, 20, pp. 19–23 (in Russian).
4. Kuchminskaya Kh.: 1987, ‘On approximation of functions by two-dimensional continued fractions’, Rational Approximation and its Applications in Mathematics and Physics (Eds. J. Gilewicz, M. Pindor, W.Siemaszko), Lecture Notes in mathematics, Springer-Verlag, 1237, pp. 207–216.
5. Kuchminskaya Kh.: 1989, ‘Convergence criteria for two-dimensional continued fractions with complex elements’,Melody issledovaniya differencialnyh i integralnyh operatorov, Naukova Dumka, Kiev, pp.122–127 (in Russian).