@article{10_1017_S0017089504001910,
     author = {KARAEV, M. T. and PEHLIVAN, S.},
     title = {SOME {RESULTS} {FOR} {QUADRATIC} {ELEMENTS} {OF} {A} {BANACH} {ALGEBRA}},
     journal = {Glasgow mathematical journal},
     pages = {431--441},
     year = {2004},
     volume = {46},
     number = {3},
     doi = {10.1017/S0017089504001910},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089504001910/}
}