1. P. Turán,Eine neue Methode in der Analysis und deren Anwendungen (Budapest, 1953), Akadémiai Kiadó.
2. P. Turán, On Lindelöf's conjecture,Acta Math. Acad. Sci. Hung. 5 (1954), pp. 145–163.
3. This is an unpublished sharpening of Theorem XXXVIII of 1.
4. G. Szegő, Über eine Eigenschaft der Exponentialreihe,Sitzungsber. der Berl. Math. Ges.,23 (1924), pp. 50–63.
5. Another very elegant verification is due toE. Egerváry. Using Euler's formulae valid for any polynomial ω(z) with simplez j-zeros of degreen and using the result follows at once.