@article{ZNSL_2013_415_a13,
     author = {S. S. Podkorytov},
     title = {On homotopy invariants of finite degree},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {109--136},
     publisher = {mathdoc},
     volume = {415},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2013_415_a13/}
}