1. Homotopy mod C of spheres of category 2;Berstein;Comment. Math. Helv.,1961
2. Halbexakte Homotopiefunktoren;Dold,1966
3. N. Dyer and A. Sieradski, A homotopy classification of 2-complexes with finite cyclic fundamental group, preprint.
4. Über die Homotopiegruppen von Gruppenräumen;Eckmann;Comment. Math. Helv.,1942
5. Stable homotopy;Freyd,1966