@article{EUG_1995_43_a1,
     author = {Vangelis Th. Paschos},
     title = {Studying graph - stability to apprehend relative hardness of constructive-non-constructive approximation},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}},
     pages = {37--54},
     year = {1995},
     volume = {43},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1995_43_a1/}
}