1. Some consequences of the axiom of constructibility;Addison;Fundam. Math.,1959
2. Boolean-Valued Models and Independence Proofs in Set Theory;Bell,1985
3. Equivalences generated by families of Borel sets;Burgess;Proc. Am. Math. Soc.,1978
4. On fundamental groups with the quotient topology;Brazas;J. Homotopy Relat. Struct.,2015
5. Discreteness and homogeneity of the topological fundamental group;Calcut;Topol. Proc.,2009