1. 11. Gibbs P. , A generalised Stern-Brocot tree from regular Diophantine quadruples, preprint, math.NT/9903035.
2. 13. Heath T. L. , Diophantus of Alexandria: a study in the history of Greek algebra. Second edition. With a supplement containing an account of Fermat's theorems and problems connected with Diophantine analysis and some solutions of Diophantine problems by Euler (Powell's Bookstore, Chicago and Martino Publishing, Mansfield Center, 2003), 177–181.
3. THE EQUATIONS 3x2−2 = y2 AND 8x2−7 = z2
4. An Absolute Bound for the Size of Diophantine m-Tuples
5. 12. Fujita Y. , The extensibility of Diophantine pairs k−1, k+1, preprint.