"Arithmetic and normal subgroup structure"
"Between normal and characteristic and beyond"
"Contrasting subnormality of various depths"
"Direct factor versus normal"
"Distribution of normal subgroups in a group"
"Measuring deviation from normality"
"Normal versus characteristic"
"Normal versus permutable"
"Proving that a subgroup is normal"
"Replacing a subgroup by a normal subgroup"
"Subnormal-to-normal and normal-to-characteristic"
"Ubiquity of normality"
"Using that a subgroup is normal"
"Varying normality"
"Varying simplicity"