Limit semigroups of Bernstein-Schnabl operators associated with positive projections
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 16 (1989) no. 2, pp. 259-279. 
@article{ASNSP_1989_4_16_2_259_0,
     author = {Altomare, Francesco},
     title = {Limit semigroups of {Bernstein-Schnabl} operators associated with positive projections},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {259--279},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 16},
     number = {2},
     year = {1989},
     mrnumber = {1041898},
     zbl = {0706.47022},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1989_4_16_2_259_0/}
}
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Altomare, Francesco. Limit semigroups of Bernstein-Schnabl operators associated with positive projections. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 16 (1989) no. 2, pp. 259-279. http://www.numdam.org/item/ASNSP_1989_4_16_2_259_0/

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