@article{MM2_1998__95_3_156376,
     author = {J\'ulius Korbas and Andr\'as Szucs},
     title = {The {Lyusternik-Shnirel'man} category, vector bundles, and immersions of manifolds.},
     journal = {Manuscripta mathematica},
     pages = {289--294},
     publisher = {mathdoc},
     volume = {95},
     number = {3},
     year = {1998},
     zbl = {0927.55008},
     url = {http://geodesic.mathdoc.fr/item/MM2_1998__95_3_156376/}
}