KLYUSHIN, D. A.; SHTYK, Ya. V. CLASSIFICATION OF MULTIVARIATE SAMPLES USING PETUNIN ELLIPSES. Journal of Numerical and Applied Mathematics, [S. l.], n. 1 (133), p. 59–67, 2020. DOI: 10.17721/2706-9699.2020.1.05. Disponível em: https://jnam.knu.ua/index.php/jnam/article/view/85. Acesso em: 6 oct. 2026.