1. Raszillier, I.: Lettere al Nuovo Cimento2, 349 (1971).
2. — Maximal information on the pion electromagnetic form factor att <4m 2 and its derivative att=0 frome + e −→π+π− data. Institute of Physics Bucharest Preprint, September 1971.
3. Privalov, I. I.: Boundary properties of analytic functions (in Russian), Second Edition, p. 107. Moscow-Leningrad: GITTL 1950.
4. Carathéodory, C.: Funktionentheorie, Vol. 2, p. 14. Basel: Birkhäuser 1950.
5. —— Funktionentheorie, Vol. 2, p. 21. Basel: Birkhäuser 1950.