1. Spaces of finite characteristic;Barratt, M. G.;Quart. J. Math. Oxford Ser. (2),1960
2. Homotopy 𝑚𝑜𝑑.𝐶 of spaces of category 2;Berstein, Israël;Comment. Math. Helv.,1961
3. The homotopy groups of a triad. II;Blakers, A. L.;Ann. of Math. (2),1952
4. Axioms for the generalized Pontryagin cohomology operations;Browder, W.;Quart. J. Math. Oxford Ser. (2),1962
5. An homology analogue of Postnikov systems;Brown, Edgar H., Jr.;Michigan Math. J.,1959