@article{10_4064_fm_69_1_63_91,
     author = {Stanis{\l}aw Godlewski},
     title = {Homotopy dependence of fundamental sequences, relative fundamental equivalence of sets and a generalization of cohomotopy groups},
     journal = {Fundamenta Mathematicae},
     pages = {63--91},
     publisher = {mathdoc},
     volume = {69},
     number = {1},
     year = {1970},
     doi = {10.4064/fm-69-1-63-91},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-69-1-63-91/}
}