1. Lapina, N.A., Maksimova, N.A., Starichenko, N.S., et al., Carbonization of coal-tar pitch with increased softening temperatures, in Konstruktsionnye materialy na osnove ugleroda (Carbon-Based Constructional Materials), Moscow: Metallurgiya, 1974, pp. 41–50.
2. Karpin, G.M. and Kondratov, V.K., Properties and structure of a and a1 fractions in coal tar and pitch and isolation of the a1 fraction from highly pyrolyzed tar, Coke Chem., 2007, vol. 50, no. 10, pp. 299–303.
3. Fedotov, M.V. and Kasperskii, V.G., Influence of pitch substances insoluble in quinoline on the properties of carbon materials, in Konstruktsionnye materialy na osnove ugleroda (Carbon-Based Constructional Materials), Moscow: Metallurgiya, 1975, pp. 117–122.
4. Lapina, N.A. and Ostrovskiy, V.S., Physicochemical and structural transformations of coal tar pitch in carbonization, Vsesoyuznoe soveshchanie po khimii i tekhnologii tverdogo topliva, Tezisy dokladov (All-Union Conf. on Chemistry and Technology of Solid Fuels, Abstracts of Papers), Moscow: Metallurgiya, 1976, pp. 74–76.
5. Lapina, N.A. and Ostrovskiy, V.S., The influence of insoluble pitch component in carbonization and the properties of pitch coke, in Konstruktsionnye materialy na osnove ugleroda (Carbon-Based Constructional Materials), Moscow: Metallurgiya, 1983, pp. 31–35.