@article{GAMA_1966__18_7-8_43380,
     author = {Emilio P. Carranza},
     title = {C\'alculo de sumas por m\'etodo combinatorio.},
     journal = {Gaceta Matem\'atica},
     pages = {203},
     publisher = {mathdoc},
     volume = {18},
     number = {7-8},
     year = {1966},
     language = {sp},
     url = {https://geodesic-test.mathdoc.fr/item/GAMA_1966__18_7-8_43380/}
}