1. M. Kac, W. Murdock, and G. Szegö,On the eigenvalues of certain Hermitian forms, J. Rat. Mech. Analysis2 (1953), 767–800.
2. M. A. Evgrafov,On an integral transformation and its application to estimating the number of characteristic values of certain integral operators (Russian), Trudy Moskov. Mat. Obsc.17 (1967), 273–292.
3. H. J. Landau and H. O. Pollak,Prolate spheroidal wave functions, Fourier analysis and uncertainty-II, Bell System Tech.40 (1961), 65–84.
4. H. J. Landau,Necessary conditions for sampling and interpolation of certain entire functions, Acta Math.117 (1967), 37–52.
5. F. Riesz and B. Sz.-Nagy,Functional Analysis, Ungar, New York, 1955.