1. Čech methods and the adjoint functor theorem;Betti;Cahiers Topologie Géom. Différentielle Catégoriques,1985
2. Concerning homotopy properties of compacta;Borsuk;Fund. Math.,1965
3. Kan extensions of homotopy functors;Calder;J. Pure Appl. Algebra,1978
4. Shape Theory. Categorical Methods of Approximation;Cordier,1989
5. Remark on Čech extensions of cohomology functors;Deleanu;Proc. Adv. St. Inst. Aarhus,1970