1. D. I. Bodnar, Branched Continued Fractions [in Russian], Naukova Dumka, Kiev (1986).
2. W. B. Jones and W. J. Thron, Continued Fractions: Analytic Theory and Applications, Addison-Wesley, Reading, MA (1980).
3. Kh. Yo. Kuchmins’ka, “Corresponding and associated branched continued fractions for a double power series,” Dopov. Akad. Nauk Ukr. SSR, Ser. A, No. 7, 614–618 (1978).
4. Kh. Yo. Kuchmins’ka, Two-Dimensional Continued Fractions [in Ukrainian], Institute for Applied Problems of Mechanics and Mathematics, Lviv (2010).
5. Kh. Yo. Kuchmins’ka, O. M. Sus’, and S. M. Vozna, “Approximation properties of two-dimensional continued fractions,” Ukr. Mat. Zh, 55, No. 1, 30–44 (2003); English translation: Ukr. Math. J., 55, No. 1, 36–54 (2003).