Б.А. Дуйсенгалиева and А.С. Науразбекова 2020. Amalgamated free product structure of the tame automorphism group of a free Novikov algebra of rank 2. Bulletin of L.N. Gumilyov Eurasian National University. Mathematics, computer science, mechanics series. 130, 1 (Mar. 2020), 73–81.