Week graded analogues of Gauss lemma and Eisenstein criterion
A. N. Khaikin

References
1.	Kovačič J., “Eisenstein criterion for noncommutative polynomials”, Proc. Amer. Math. Soc., 34, no. 1, 1972, 25–29
2.	Berkovich L. M., “Analog kriteriya Eizenshteina dlya obyknovennykh lineinykh differentsialnykh uravnenii”, Mezhvuzovskii sbornik nauchnykh statei, Kuibyshev, 1988, 20–27
3.	Bavula V. V., “O nekotorykh obobscheniyakh kriteriya Eizenshteina”, Ukr. mat. zhurn., 42:7, 983–985