1. On the unicity conjecture for Markoff numbers;Baragar;Canad. Math. Bull.,1996
2. The uniqueness of the prime Markoff numbers;Button;Bull. London Math. Soc.,1998
3. An Introduction to Diophantine Approximation;Cassels,1957
4. A Course in Computational Algebraic Number Theory;Cohen,1993
5. The Markoff and Lagrange Spectra;Cusick,1989