@article{CMUC_1993__34_2_a2,
     author = {Kepka, Tom\'a\v{s}},
     title = {Semirings whose additive endomorphisms are multiplicative},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {213--219},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1993},
     mrnumber = {1241729},
     zbl = {0787.16029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1993__34_2_a2/}
}