1. Pokornyi, Yu.V., Penkin, O.M., Pryadiev, V.L., et al., Differentsial’nye uravneniya na geometricheskikh grafakh (Differential Equations on Geometric Graphs), Moscow, 2004.
2. Pokornyi, Yu.V., Bakhtina, Zh.I., Zvereva, M.B., and Shabrov, S.A., Ostsillyatsionnyi metod Shturma v spektral’nykh zadachakh (Sturm Oscillation Method in Spectral Problems), Moscow, 2009.
3. Zavgorodnij, M.G. and Pokornyi, Yu.V., On the Spectrum of Second-Order Boundary Value Problems on Space Nets, Uspekhi Mat. Nauk, 1989, vol. 44, no. 8, pp. 220–221.
4. Zavgorodnij, M.G., On Evolution Problems on Graphs, Uspekhi Mat. Nauk, 1991, vol. 46, no. 6, pp. 199–200.
5. Zavgorodnij, M.G., Spectral Completeness of Root Functions of a Boundary Value Problem on a Graph, Dokl. Akad. Nauk, 1994, vol. 335, no. 3, pp. 281–283.