@article{MABA_1993_7_2_a5,
     author = {D. K. Dimitrov},
     title = {Hernstein {Inequality} in {L2} {Norm}},
     journal = {Mathematica balkanica},
     pages = {131},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1993},
     url = {http://geodesic.mathdoc.fr/item/MABA_1993_7_2_a5/}
}