@article{CLTM_1997_1997_1_a9,
     author = {Borovoi, Mikhail and Kunyavskii, Boris},
     title = {Espacios esf\'ericos para los que fallan el principio de {Hasse} y la aproximaci\'on d\'ebil.},
     journal = {Collectanea mathematica},
     pages = {41-52},
     publisher = {mathdoc},
     volume = {48},
     number = {1-2},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1997_1997_1_a9/}
}