[1]
E. M. Parasyuk and L. M. Zory, β€œOn the multiplication problem of ordinary differential equations ”, Ukr. Mat. Zhurn., vol. 23, no. 6, pp. 804–807, Oct. 1971, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/8631