1.
ZaviyalovОI, PolivanovМK. R-operation of Bogolyubov—Parasyuk and operator expansions in mass-free theories . Ukr. Mat. Zhurn. [Internet]. 1992Apr.2 [cited 2024Jul.27];44(3):333-40. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8102