@article{EUG_1989__21_a6,
     author = {Konstantin Stathakopoulos},
     title = {Stetigkeit des {Spektrums} im {Kleinen} {Einer} {Klasse} {Nichtlineare} {Operatoren} {I}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}
},
     pages = {67-80},
     publisher = {mathdoc},
     volume = {21},
     year = {1989},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1989__21_a6/}
}