@article{GAMA_1974_1974_1_a0,
     author = {Bisay Dondo, Jose M.},
     title = {Nueva expresi\'on de sumaci\'on.},
     journal = {Gaceta matem\'atica},
     pages = {4-5},
     publisher = {mathdoc},
     volume = {26},
     number = {1-2},
     year = {1974},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1974_1974_1_a0/}
}