@article{10_4153_CMB_1969_060_4,
     author = {Tarwater, J. D. and Entringer, R. C.},
     title = {Sums of {Complexes} in {Torsion-Free} {Abelian} {Groups}},
     journal = {Canadian mathematical bulletin},
     pages = {475--478},
     year = {1969},
     volume = {12},
     number = {4},
     doi = {10.4153/CMB-1969-060-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-060-4/}
}