@article{10_4153_CMB_1985_047_x,
     author = {Ellers, Erich W.},
     title = {Products of {Elations} and {Harmonic} {Homologies}},
     journal = {Canadian mathematical bulletin},
     pages = {397--400},
     year = {1985},
     volume = {28},
     number = {4},
     doi = {10.4153/CMB-1985-047-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1985-047-x/}
}