@article{MABA_2013_27_1-2_a3,
     author = {S. Gal and G. Tachev},
     title = {The {Lower} {Estimate} for {Bernstein} {Operator}},
     journal = {Mathematica balkanica},
     pages = {39},
     publisher = {mathdoc},
     volume = {27},
     number = {1-2},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/MABA_2013_27_1-2_a3/}
}