MathSciNet bibliographic data MR501951 (80a:20049) 20G15 (13C10 14K30) Wright, David The amalgamated free product structure of ${\rm GL}\sb{2}(k[X\sb{1},\cdots,X\sb{n}])$${\rm GL}\sb{2}(k[X\sb{1},\cdots,X\sb{n}])$ and the weak Jacobian theorem for two variables. J. Pure Appl. Algebra 12 (1978), no. 3, 235–251. Article

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