1. Aleksandroff, P.S.: On some basic directions in general topology, Russian Math. Surveys 19 (1964), 6.1–39.
2. -: corrections to above, ibid 20 (1965) 1.177–178.
3. Banaschewski, B.: Projective covers in categories of topological spaces and topological algebras, Proc. Kanpur Top. Conference (1968), Academia, Prague, 63–91.
4. Barr, M., Beck, J.: Homology and standard constructions, Lecture Notes in Mathematics 80, Springer-Verlag (1969), 245–335.
5. Bartik, V.: Aleksandrov-Čech cohomology and mappings into Eilenberg-MacLane polyhedra, Math. USSR Sbornik 5 (1968), 221–228.