no. 1
The nonlinear superposition operator acting on Bergman spaces
Compositio Mathematica, Tome 93 (1994) no. 1, pp. 23-35 
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     title = {The nonlinear superposition operator acting on {Bergman} spaces},
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     pages = {23--35},
     year = {1994},
     publisher = {Kluwer Academic Publishers},
     volume = {93},
     number = {1},
     mrnumber = {1286796},
     zbl = {0806.47060},
     language = {en},
     url = {https://www.numdam.org/item/CM_1994__93_1_23_0/}
}
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Camera, G. A.; Gimenez, J. The nonlinear superposition operator acting on Bergman spaces. Compositio Mathematica, Tome 93 (1994) no. 1, pp. 23-35. https://www.numdam.org/item/CM_1994__93_1_23_0/

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