On general concept of basic subgroups. II. Jindřich Bečvář, Pavel Jambor (1973) Commentationes Mathematicae Universitatis Carolinae
On reduced products of abelian groups Manfred Dugas (1985) Rendiconti del Seminario Matematico della Università di Padova
On summands of direct products of Abelian groups John D. O'Neill (1983) Commentationes Mathematicae Universitatis Carolinae
On the algebraic compactness of some quotients of product groups G. De Marco (1975) Rendiconti del Seminario Matematico della Università di Padova
On the Cayley-Hamilton property in abelian groups. Militello, Robert R. (1992) International Journal of Mathematics and Mathematical Sciences
On the Suslin number of subgroups of products of countable groups Vladimir Vladimirovich Uspenskij (1995) Acta Universitatis Carolinae. Mathematica et Physica