@article{ZNSL_2005_329_a12,
     author = {S. S. Podkorytov},
     title = {Mappings of the sphere to a simply connected space},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {159--194},
     publisher = {mathdoc},
     volume = {329},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2005_329_a12/}
}