1. An Introduction to the Geometry of Numbers;Cassels,1959
2. Minimal solutions of diophantine equations;Holzer;Canad. J. Math.,1950
3. Three dimensional reduction and Legendre's equation;Mitchell,1997
4. On the magnitude of the integer solutions of the equationax2by2cz2;Mordell;J. Number Theory,1969
5. On the size of a solution of Legendre's equation;Williams;Utilitas Mathematica,1988