1. Some relevant properties of the equations x 2 +y 2 +z 2 +v 2 =dXYZV, and x 2 +y 2 +z 2 +v 2 +u 2 =dXYZVU and x i +y i +z i + v i =dXYZV (where i is a positive integer), have been introduced and which can help in solving those and related equations;X;Given the foregoing and since X=(gXYZVU
2. I. Bibliography and pseudo-Bibliography
3. Palindromization and construction of Markoff triples;A Abram;Theoretical Computer Science,2020
4. On Diophantine equations and nontrivial Racah coefficients;A Bremner;Journal of Mathematical Physics,1986