@article{ASUO_2015_XXIII_1_a21,
     author = {Radu Paltanea and Gabriel Stan},
     title = {Transfomation of the second order modulus by positive linear operators},
     journal = {Analele Universit\u{a}\c{t}ii "Ovidius" Constan\c{t}a Seria Matematic\u{a}},
     publisher = {mathdoc},
     volume = {XXIII},
     number = {1},
     year = {2015},
     url = {http://geodesic.mathdoc.fr/item/ASUO_2015_XXIII_1_a21/}
}