From a single chain to a large family of submodules. Fuchs, Laszlo, Lee, Sang Bum (2004) Portugaliae Mathematica. Nova Série
Fully Invariant Subgroups of n -Summable Primary Abelian Groups Peter Danchev (2011) Annales mathématiques Blaise Pascal We present a number of results concerning fully invariant subgroups of n -summable groups.