1. N. Achieser and M. Krein On certain problems in the theory of moments (in Russian), Kharkoff, 1938, 254 pp.
2. La théorie des noyaux reproduisants et ses applications. I;Aronszajn, N.;Proc. Cambridge Philos. Soc.,1943
3. Theory of reproducing kernels;Aronszajn, N.;Trans. Amer. Math. Soc.,1950
4. Sur les fonctions absolument monotones;Bernstein, Serge;Acta Math.,1929
5. S. Bochner Fouriersche Integrale, Leipzig, 1932, 227 pp.