@article{GAMA_1973_1973_1_a5,
     author = {L\'opez S\'anchez, M.},
     title = {Entretenimientos matem\'aticos con la {I.} {B.} {M.} 1620 {II.}},
     journal = {Gaceta matem\'atica},
     pages = {89-93},
     publisher = {mathdoc},
     volume = {25},
     number = {3-4},
     year = {1973},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1973_1973_1_a5/}
}