D. S.; Beiler, Albert H. (1968), "Albert Beiler, Consecutive Hypotenuses of Pythagorean Triangles", Mathematics of Computation, 22 (103): 690–692, doi:10.2307/2004563, JSTOR2004563. This review of a manuscript of Beiler's (which was later published in J. Rec. Math.7 (1974) 120–133, MR0422125) attributes this bound to Landau.
D. S.; Beiler, Albert H. (1968), "Albert Beiler, Consecutive Hypotenuses of Pythagorean Triangles", Mathematics of Computation, 22 (103): 690–692, doi:10.2307/2004563, JSTOR2004563. This review of a manuscript of Beiler's (which was later published in J. Rec. Math.7 (1974) 120–133, MR0422125) attributes this bound to Landau.
D. S.; Beiler, Albert H. (1968), "Albert Beiler, Consecutive Hypotenuses of Pythagorean Triangles", Mathematics of Computation, 22 (103): 690–692, doi:10.2307/2004563, JSTOR2004563. This review of a manuscript of Beiler's (which was later published in J. Rec. Math.7 (1974) 120–133, MR0422125) attributes this bound to Landau.