Some properties of Holmgren-Riesz transform
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Volume 15 (1961) no. 1-2, p. 1-24
@article{ASNSP_1961_3_15_1-2_1_0,
     author = {Bassam, M. A.},
     title = {Some properties of Holmgren-Riesz transform},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 15},
     number = {1-2},
     year = {1961},
     pages = {1-24},
     zbl = {0099.31402},
     mrnumber = {130538},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1961_3_15_1-2_1_0}
}
Bassam, M. A. Some properties of Holmgren-Riesz transform. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Volume 15 (1961) no. 1-2, pp. 1-24. http://www.numdam.org/item/ASNSP_1961_3_15_1-2_1_0/

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7 Riesz Marcel, « L'integral de Riemann-Liouville et le probleme de Cauchy », Acta Mathematica, V. 81 (1949), pp. 1-223. | MR 30102 | Zbl 0033.27601