@article{SMJ2_2014_40_3-4_a4,
     author = {Gadjev, Ivan},
     title = {Strong {Converse} {Result} for {Baskakov} {Operator}},
     journal = {Serdica Mathematical Journal},
     pages = {273--318},
     publisher = {mathdoc},
     volume = {40},
     number = {3-4},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2014_40_3-4_a4/}
}