no. 2
Rings of Hilbert modular forms
Compositio Mathematica, Tome 48 (1983) no. 2, pp. 139-165. 
@article{CM_1983__48_2_139_0,
     author = {Thomas, E. and Vasquez, A. T.},
     title = {Rings of {Hilbert} modular forms},
     journal = {Compositio Mathematica},
     pages = {139--165},
     publisher = {Martinus Nijhoff Publishers},
     volume = {48},
     number = {2},
     year = {1983},
     mrnumber = {700001},
     zbl = {0515.10027},
     language = {en},
     url = {http://www.numdam.org/item/CM_1983__48_2_139_0/}
}
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Thomas, E.; Vasquez, A. T. Rings of Hilbert modular forms. Compositio Mathematica, Tome 48 (1983) no. 2, pp. 139-165. http://www.numdam.org/item/CM_1983__48_2_139_0/

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