no. 2
Rings of differential operators over rational affine curves
Bulletin de la Société Mathématique de France, Tome 118 (1990) no. 2, pp. 193-209. 
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     title = {Rings of differential operators over rational affine curves},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {193--209},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {118},
     number = {2},
     year = {1990},
     doi = {10.24033/bsmf.2143},
     mrnumber = {91m:16023},
     zbl = {0722.16013},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/bsmf.2143/}
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Letzter, Gail; Makar-Limanov, Leonid. Rings of differential operators over rational affine curves. Bulletin de la Société Mathématique de France, Tome 118 (1990) no. 2, pp. 193-209. doi : 10.24033/bsmf.2143. http://www.numdam.org/articles/10.24033/bsmf.2143/

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