___

• [1] Adamek, J., Herrlich, H., Strecker, G.E., Abstract and Concrete Categories, John Wiley and Sons (1990), New York.
• [2] Herrlich, H., Topological Functor, Gen. Topology Appl. (1974), 4, 125–142.
• [3] Preuss, G., Theory of Topological Structure, An Approach to Topological Categories D. Reidel Publ. Co., Dordrecht (1988).
• [4] Baran, M., Separation Properties, Indian J. Pure Appl. Math. ( 1991), Vol. 23, 333–341.
• [5] Baran, M., Altindis, H., T2-objects in topological categories, Acta Math. Hungar. (1996), Vol. 71, 41–48.
• [6] Baran, M., T3 and T4 -Objects in topological categories, Indian J. Pure Appl. Math. (1998), Vol. 29, 59–69.
• [7] Baran, M., Completely regular objects and normal objects in topological categories, Acta Math. Hungar. (1998), Vol. 80, 211–224.
• [8] Baran, M., Separation Properties in Topological Categories, Math. Balkanica, (1996), Vol. 10 , 39–48.
• [9] Baran, M., Altindis, H., T0 objects in topological categories, J. Univ. Kuwait (Sci.) , (1995), Vol. 22 , 123–127.
• [10] Lowen, R., Approach spaces; a common supercategory of TOP and MET, Mathematische Nachrichten, (Nov. 1989), vol. 141, Issue 1, 183–226.
• [11] Lowen, R., Index Analysis: Approach Theory at Work, Springer, (2015).
• [12] Lowen, R., Sioen, M., Approximation in Functional Analysis, Result.Math., (2000), Vol. 37, 345–372 .
• [13] Lowen, R., Sioen, M., A note on separation in AP, Applied General Topology, (2003), Vol. 4, 475–486.
• [14] Marny, T., Rechts-Bikategoriestrukturen in topologischen kategorien, Dissertation, Free university Berlin, (1973).
• [15] Weck-Schwarz, S., T0 objects and separated objects in topological categories, Quaestiones Math., (1991), Vol. 14 , 315–325.
• [16] Adamek, J., Reiterman, J., Cartesian Closed Hull for Metric Spaces, Comment. Math. Univ. Carolinae, (1990), Vol. 31, 1–6.