@article{RCM_1968__2_181555,
     author = {A. Tkahashi and C. Takahashi},
     title = {Un nuevo m\`etodo de sumaci\'on},
     journal = {Revista colombiana de matematicas},
     pages = {29--44},
     year = {1968},
     volume = {2},
     url = {http://geodesic.mathdoc.fr/item/RCM_1968__2_181555/}
}