@article{10_4153_CMB_1969_059_3,
     author = {Berlekamp, E.R.},
     title = {On {Subsets} with {Intersections} of {Even} {Cardinality}},
     journal = {Canadian mathematical bulletin},
     pages = {471--474},
     year = {1969},
     volume = {12},
     number = {4},
     doi = {10.4153/CMB-1969-059-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-059-3/}
}