Fundamental groups and finite sheeted coverings
Brown-Grossman-Quigley fundamental group
Brown-Grossman-Quigley and Steenrod-Quigley homotopy groups
Spanier fundamental topological group and progroup
Borsuk-Čech topological fundamental group
Steenrod-Quigley toplogical fundamental group.
scientific article; zbMATH DE number 5638333
scientific article