@article{ASNSP_1993_4_20_4_545_0,
     author = {Fern\'andez-Cabrera, Luz M. and Torrea, Jos\'e L.},
     title = {The two weight problem for operators in the upper half-plane},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {545--574},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 20},
     number = {4},
     year = {1993},
     mrnumber = {1267599},
     zbl = {0803.42010},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1993_4_20_4_545_0/}
}