1. Groups of Homotopy Classes;Arkowitz-Curjel;Springer Lecture notes No. 4,1967
2. On semi-simplicial fibre bundles;Barratt;Am. J. Math.,1959
3. Obstruction Theory;Baunes;Springer Lecture notes No. 628,1978
4. Homolopy Limits Completions and Localizations;Bousfield,1972
5. E. Dror:A Generalization of Whitehead Theorem. Springer Lecture notes No. 299.