@article{PORMA_1987__44_1_115564,
     author = {Ribeiro, Hugo},
     title = {Just half a century ago...},
     journal = {Portugaliae mathematica},
     pages = {III--IV},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1987},
     mrnumber = {0911828},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1987__44_1_115564/}
}