@article{MABA_2005_19_1-2_a4,
     author = {Jia{\textemdash}ding Cao and Heiner Gonska and Daniela Kacso;},
     title = {On the {Impossibility} of {Certain} {Lower} {Estimates} for {Sequences} of {Linear} {Operators}},
     journal = {Mathematica balkanica},
     pages = {39},
     publisher = {mathdoc},
     volume = {19},
     number = {1-2},
     year = {2005},
     url = {http://geodesic.mathdoc.fr/item/MABA_2005_19_1-2_a4/}
}