P. Lizunov, A. Biloshchytskyi, A. Kuchansky, Y. Andrashko, and S. Biloshchytska, “The use of probabilistic latent semantic analysis to identify scientific subject spaces and to evaluate the completeness of covering the results of dissertation studies”, EEJET, vol. 4, no. 4 (106), pp. 21–28, Aug. 2020.