1. On arrangement of ovals of real plane algebraic curves, the involutions of four-dimensional smooth manifolds, and the arithmetic of integer-valued quadratic forms;Arnold;Funkcional. Anal. i Priložen,1971
2. The distribution of nodes of given degree in random trees;Drmota;J. Graph Theory,1999
3. Graphical Enumeration;Harary,1973
4. D. Knuth, The Art of Computer Programming, Vol. 1, Addison-Wesley Publishing Co., Reading, MA, London, Don Mills, Ont., 1968.
5. Asymptotic growth of the number of classes of real plane algebraic curves as the degree grows;Orevkov;Zapiski Nauchn. Semin. POMI,2000