%0 Journal Article %A Oto Strauch %A János Tóth %T Asymptotic density of A⊂ ℕ and density of the ratio set R(A) %J Acta Arithmetica %D 1998 %P 67-78 %V 87 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-87-1-67-78/ %R 10.4064/aa-87-1-67-78 %G en %F 10_4064_aa_87_1_67_78