1. Eilenberg–Borsuk theorem for maps into arbitrary complexes;Dranishnikov;Mat. Sb.,1994
2. Topology;Dugundji,1968
3. General Topology;Engelking,1977
4. The Mardešić factorization theorem for extension theory and C-separation;Levin;Proc. Amer. Math. Soc.,2000
5. Categories for the Working Mathematician;MacLane,1998