@article{10_4064_ba200302_5_10,
     author = {Adam Os\k{e}kowski},
     title = {Inequalities for second-order {Riesz} transforms associated with {Bessel} expansions},
     journal = {Bulletin of the Polish Academy of Sciences. Mathematics},
     pages = {75--88},
     publisher = {mathdoc},
     volume = {68},
     number = {1},
     year = {2020},
     doi = {10.4064/ba200302-5-10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ba200302-5-10/}
}