Zhadyranova, A. and Anuarbekova, Y. 2022. Hierarchy of WDVV associativity equations for n = 3 case and N = 2 when V0 = 0. BULLETIN OF THE L.N. GUMILYOV EURASIAN NATIONAL UNIVERSITY. PHYSICS. ASTRONOMY SERIES. 128, 3 (Jul. 2022), 79–85. DOI:https://doi.org/10.32523/2616-6836-2019-128-3-79-85.