@article{ZNSL_1991_191_a7,
     author = {D. M. Ivanov},
     title = {On cosets of extremal doubly even codes of length 48},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {91--100},
     year = {1991},
     volume = {191},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_191_a7/}
}