1. E. Cohen, Arithmetical functions associated with the unitary divisors of an integer, Math. 74 (1960), 66-80.
2. N.G. De Bruijn, C. van Ebbenhorst Tengbergen, D. Kruyswijk, On the set of divisors of a number, Nieuw Arch. Wisk. 23 (1952), 191-193.
3. P. Erdős, On a lemma of Littlewood and Offord, Bull. Amer. Math. Soc. 51 (1945), 898-902.
4. P. Erdős, J. Schönheim, On the set of non pairwise coprime divisors of a number, in "Combinatorial Theory and its Applications" Vol. 1, pp. 369-376, Coll. Math. Soc. J. Bolayi 2 (P. Erdős, A. Rényi, V.T. Sós eds.), North-Holland, Amsterdam-London 1970.
5. P. Erdős, J. Schönheim, Sets versus divisors, in "Combinatorics, Paul Erdős is Eighty" Vol. 2, pp. 193-212, Bolayi Society Mathematical Studies, 2 (Keszthely, 1993), Budapest 1996.
6. A. Kertész, On groups every subgroup of which is a direct summand, Publ. Math. 2 (1951), 74-75.
7. J. Knopfmacher, Abstract Analytic Number Theory, North-Holland Mathematical Library Vol. 12, North-Holland & American Elsevier, Amsterdam-Oxford-New York 1975.
8. P.J. McCarthy, Introduction to Arithmetical Functions, Springer Verlag, New York 1986.
9. W. Narkiewicz, On a class of arithmetical convolutions, Coll. Math. 10 (1963), 81-94.
10. Š. Porubský, Sets of regular systems of divisors of a generalized integer, Ann. Math. Sil. 12 (1998), 149-156.
11. J. Schönheim, A generalization of results of P. Erdős, G. Katona and D.J. Kleitman concerning Sperner's theorem, J. Combin. Theory 11 (1971), 111-117.
12. E. Sperner, Ein Satz über Untermengen einer endlichen Menge, Math. Zeit. 27 (1928), 544-548.
Google Scholar
10.1515/amsil
English