Karmanova E. O. «On congruences of paths» // 2011. №2(12) C.96-100
Shihiev Sh. B., Mirzabekov Ya. M. «Formal grammar of Russian language in examples» // Applied Discrete Mathematics 2018. №40 C.114-126
Salii V. N. «The sperner property for trees» // Applied Discrete Mathematics. Supplement 2015. №8 C.124-127
