@article{EUG_1990_25_a7,
     author = {Aigli Papantonopoulou},
     title = {Minimal {Surface} in the {4-Quadric}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}},
     pages = {107--112},
     year = {1990},
     volume = {25},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1990_25_a7/}
}