@article{10_4064_fm_99_1_35_42,
     author = {Karol Borsuk},
     title = {On the {Lusternik-Schnirelmann} category in the theory of shape},
     journal = {Fundamenta Mathematicae},
     pages = {35--42},
     publisher = {mathdoc},
     volume = {99},
     number = {1},
     year = {1978},
     doi = {10.4064/fm-99-1-35-42},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-99-1-35-42/}
}