@article{AUPCM_2016_15_a7,
     author = {Kr\'ol-Klimkowska, El\.zbieta and Ptak, Marek},
     title = {Properties of two variables {Toeplitz} type operators},
     journal = {Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica},
     publisher = {mathdoc},
     number = {15},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPCM_2016_15_a7/}
}