@article{10_4153_CMB_1969_061_1,
     author = {Heilbronn, H. and Scherk, P.},
     title = {Sums of {Complexes} in {Torsion} {Free} {Abelian} {Groups}},
     journal = {Canadian mathematical bulletin},
     pages = {479--480},
     year = {1969},
     volume = {12},
     number = {4},
     doi = {10.4153/CMB-1969-061-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-061-1/}
}