@article{10_1017_S0017089508004539,
     author = {BETANCOR, J. J. and FARI\~NA, J. C. and SANABRIA, A.},
     title = {ON {LITTLEWOOD-PALEY} {FUNCTIONS} {ASSOCIATED} {WITH} {BESSEL} {OPERATORS}},
     journal = {Glasgow mathematical journal},
     pages = {55--70},
     year = {2009},
     volume = {51},
     number = {1},
     doi = {10.1017/S0017089508004539},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089508004539/}
}