-
S. I. Adian, “Infinite irreducible systems of group identities”, Math. USSR-Izv., 4:4 (1970),
721–739 
-
P. S. Novikov, S. I. Adian, “Defining relations and the word problem for free periodic groups of odd order”, Math. USSR-Izv., 2:4 (1968),
935–942 -
P. S. Novikov, S. I. Adian, “On abelian subgroups and the conjugacy problem in free periodic
groups of odd order”, Math. USSR-Izv., 2:5 (1968),
1131–1144