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Список литературы
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| 1. |
J. F. Ritt, Differential algebra, American mathematical society, 1950   |
| 2. |
I. Kaplansky, Introduction to differential algebra, Izd. Inostr. Lit., M., 1959 |
| 3. |
V.K. Beloshapka, “Analytic complexity of functions of two variables”, Russian J. Math. Phys., 14:3 (2007), 243–249  |
