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1 A. Wilansky, "Topology for analysis" R. E. Krieger Pub. Company Inc. 1983
2 L.S. Pontryagin, "Topological groups" Gordon and Breach Science Publishers Inc. 1966
3 N. Noble, "The continuity of functions on cartesian products" 149 : 187-198, 1970
4 V.I. Malykhin, "Subspaces of sequential spaces" 64 (64): 351-356, 1998
5 S.P. Franklin, "Spaces in which sequences suffice II" 61 : 51-56, 1967
6 S.P. Franklin, "Spaces in which sequences suffice" 57 : 107-115, 1965
7 A.V. Arhangel'skii, "Some types of factor mappings and the relations between classes of topological spaces" 4 : 1726-1729, 1963
8 J.R. Boone, "Sequentially quotient mappings" 26 (26): 174-182, 1976
9 M. Husek, "Sequentially continuous homomorphisms on products of topological groups" 70 : 155-165, 1996
10 C. Xavier, "Sequentially closed sets" 14 (14): 111-130, 1980
11 A. Shibakov, "Sequential topological groups of any sequential order under CH" 155 (155): 79-89, 1998
12 A. Shibakov, "Sequential group topology on rationals with intermediate sequential order" 124 (124): 2599-2607, 1996
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18 K.D. Joshi, "Introduction to General Topology" New Age International (P) Limited 1983
19 A. Camara, "Interaction of topology and algebra in arithmetic geometry" The University of Nottingham 2013
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21 M. Venkataraman, "Directed sets in topology" 30 : 99-100, 1962
22 J.L. Kelley, "Convergence in topology" 17 : 277-283, 1950
23 A.V. Arhangel'skii, "At-lantis Studies in Mathematics, vol. I" Atlantis Press/World Scientic 2008