1. A. P. Bel’tyukov, Abstracts: Students’ Scientific Conference, Leningrad University, 1975.
2. Pure and Applied Mathematics, Vol. 20;Borevich, A. I.,1966
3. On the numerical factors of the arithmetic forms 𝛼ⁿ±𝛽ⁿ;Carmichael, R. D.;Ann. of Math. (2),1913
4. Hilbert’s tenth problem for quadratic rings;Denef, J.;Proc. Amer. Math. Soc.,1975
5. The Diophantine problem for addition and divisibility;Lipshitz, L.;Trans. Amer. Math. Soc.,1978