1. N. Itô, "Uber das Produkt von zwei abelschen Gruppen," Math. Z.,62, 400–401 (1955).
2. W. Brisley and I. D. Macdonald, "Two classes of metabelian p-groups," Math. Z.,112, 5–12 (1969).
3. B. Amberg, "Artinian and noetherian factorized groups," Rend. Sem. Mat. Univ. Padova,55, 105–122 (1976).
4. N. F. Sesekin, "On the product of finitely related Abelian groups," Sib. Mat. Zh.,6, 1427–1429 (1968).
5. N. F. Sesekin, "On the product of finitely generated Abelian groups," Mat. Zametki,13, 443–446 (1973).