. ... . ... .. , The Topology of Free Topological Groups, Journal of Mathematical Sciences, vol. 131, no. 4, 2005, pp. ... .. , , . ... .. , .. , The Fr\'echet--Urysohn and $\alpha_2$-properties in separable spaces, groups, and locally convex spaces, 13th Summer Conf. on General Topology and Its Applications, Mexico, 1998, pp.~ ...
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