@article{MABA_2007_21_3-4_a9,
     author = {Ovidiu T. Pop},
     title = {About {Some} {Linear} and {Positive} {Operators}},
     journal = {Mathematica balkanica},
     pages = {339},
     publisher = {mathdoc},
     volume = {21},
     number = {3-4},
     year = {2007},
     url = {http://geodesic.mathdoc.fr/item/MABA_2007_21_3-4_a9/}
}