@article{10_4153_CMB_1974_048_7,
     author = {Maxson, Carlton J.},
     title = {Endomorphism {Semigroups} of {Sums} of {Rings}},
     journal = {Canadian mathematical bulletin},
     pages = {247--250},
     year = {1974},
     volume = {17},
     number = {2},
     doi = {10.4153/CMB-1974-048-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-048-7/}
}