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01 012486 Cohn R.M. Difference algebra (Wiley, 1965)(600dpi)(T)(367s)_MAd_.djvu [request] 02-09-2013:03-01

02 012487 Pillay A. Differential Galois theory 1 (Illinois J.Math.42, p687, 1998)(KA)(600dpi)(T)(22s)_MAd_.djvu [request] 02-09-2013:03-01