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2. On a Pellian equation conjecture;Mordell;J. Lond. Math. Soc.,1961
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4. On square Fibonacci numbers;Cohn;J. Lond. Math. Soc.,1964
5. Solution of the problem. In the Fibonacci series F1 = 1, F2 = 1, Fn + 1 = Fn +Fn−1, the first, second and twelfth terms are squares. Are there any others?;Wylie;Am. Math. Monthly,1964