1. Minimal solutions of diophantine equations;Holzer;Can. J. Math.,1950
2. On the equation ax2 + by2 − cz2 = 0;Mordell;Monatshefte für Math.,1951
3. On the Diophantine equation ax2 + by2 − cz2 = 0;Skolem;Rendiconti die matematica delle sue applicazione,1952
4. Kleine Lösungen der diophantischen Gleichung ax2 + by2 = cz2;Kneser;Abhand. Math. Sem. Hamburg,1959