@article{EUG_1995__44_a8,
     author = {Thanassis Chryssakis},
     title = {A -range and \ensuremath{\varphi}- spatial {Numerical} range of a {Tensor} },
     journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma}
},
     pages = {71-85},
     publisher = {mathdoc},
     volume = {44},
     year = {1995},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/EUG_1995__44_a8/}
}