@article{GAMA_1974_1974_1_a3,
     author = {P\'erez De Vargas, Alberto and  Quir\'os, Mariano},
     title = {Una f\'ormula de inter\'es en f{\'\i}sica de part{\'\i}culas: {\ensuremath{\Sigma}(-l)i(ni)iK=0,n>k\ensuremath{\geq}0.}},
     journal = {Gaceta matem\'atica},
     pages = {19-21},
     publisher = {mathdoc},
     volume = {26},
     number = {1-2},
     year = {1974},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1974_1974_1_a3/}
}