On A 1 -fibrations of subalgebras of polynomial algebras
Compositio Mathematica, Tome 95 (1995) no. 3, pp. 263-285. 
@article{CM_1995__95_3_263_0,
     author = {Bhatwadekar, S. M. and Dutta, Amartya K.},
     title = {On $A^1$-fibrations of subalgebras of polynomial algebras},
     journal = {Compositio Mathematica},
     pages = {263--285},
     publisher = {Kluwer Academic Publishers},
     volume = {95},
     number = {3},
     year = {1995},
     mrnumber = {1318088},
     zbl = {0840.13011},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1995__95_3_263_0/}
}
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Bhatwadekar, S. M.; Dutta, Amartya K. On $A^1$-fibrations of subalgebras of polynomial algebras. Compositio Mathematica, Tome 95 (1995) no. 3, pp. 263-285. http://archive.numdam.org/item/CM_1995__95_3_263_0/

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