Cohn, J. H. E. (1964), “On square Fibonacci numbers”, The Journal of the London Mathematical Society, 39: 537–540, doi:10.1112/jlms/s1-39.1.537, MR0163867
Cohn, J. H. E. (1964), “On square Fibonacci numbers”, The Journal of the London Mathematical Society, 39: 537–540, doi:10.1112/jlms/s1-39.1.537, MR0163867