@article{10_4153_CMB_1982_036_x,
     author = {3rd, Wallace S. Martindale},
     title = {The {Extended} {Center} of {Coproducts}},
     journal = {Canadian mathematical bulletin},
     pages = {245--248},
     year = {1982},
     volume = {25},
     number = {2},
     doi = {10.4153/CMB-1982-036-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1982-036-x/}
}