Approximation of functions of two variables by some operators in weighted spaces
Rendiconti del Seminario Matematico della Università di Padova, Tome 101 (1999), pp. 63-82 
@article{RSMUP_1999__101__63_0,
     author = {Firlej, B. and Le\'sniewicz, M. and Rempulska, L.},
     title = {Approximation of functions of two variables by some operators in weighted spaces},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {63--82},
     year = {1999},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {101},
     mrnumber = {1705280},
     zbl = {0934.41017},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1999__101__63_0/}
}
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Firlej, B.; Leśniewicz, M.; Rempulska, L. Approximation of functions of two variables by some operators in weighted spaces. Rendiconti del Seminario Matematico della Università di Padova, Tome 101 (1999), pp. 63-82. https://www.numdam.org/item/RSMUP_1999__101__63_0/

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