@article{EUG_1990_25_a4,
     author = {N. Kalamidas and  Th. Zachariades},
     title = {On the {Productivity} of {l_1(\ensuremath{\Gamma})} {Embeddings}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}},
     pages = {65--81},
     year = {1990},
     volume = {25},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1990_25_a4/}
}