@article{RM_1966_21_5_a2,
     author = {V. G. Boltyanskii},
     title = {Basic concepts of homology and obstruction theory},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {113--132},
     publisher = {mathdoc},
     volume = {21},
     number = {5},
     year = {1966},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1966_21_5_a2/}
}