1. Problems on topological groups and other homogeneous spaces;Comfort,1990
2. Examples of locally compact non-compact minimal topological groups;Dierolf;Pacific J. Math.,1979
3. A note on Hausdorff groups;Fay;Bull. Austral. Math. Soc.,1975
4. Free products of topological groups with amalgamation;Katz;Pacific J. Math.,1985
5. Free products of topological groups with amalgation II;Katz;Pacific J. Math.,1985