@article{EUG_1987__16_a2,
     author = {I. J. Maddox},
     title = {Schur΄s {Theorem} for {Operators}},
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}
},
     pages = {18-21},
     publisher = {mathdoc},
     volume = {16},
     year = {1987},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1987__16_a2/}
}