@article{SM_2008_199_11_a4,
     author = {E. G. Sklyarenko},
     title = {The homological degree and {Hopf's} absolute degree},
     journal = {Sbornik. Mathematics},
     pages = {1687--1713},
     publisher = {mathdoc},
     volume = {199},
     number = {11},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2008_199_11_a4/}
}