1. C. H. Papadimitriou and K. Steiglitz, Combinatorial Optimization: Algorithms and Complexity, Ser. Dover Books on Computer Science, Dover Publ. (1998).
2. L. Lovász and M. D. Plummer, Matching Theory, Akadémiai Kiadó, Budapest (1986).
3. F. Harary, Graph Theory, Westwiew Press (1994).
4. O. B. Matsiy, A. V. Morozov, and A. V. Panishev, “Fast algorithm to find 2-factor of minimum weight,” Cybern. Syst. Analysis, 52, No. 3, 467–474 (2016).