[Authors] Nazarov, A. I.; Petrova, Yu. P. [Title] The small ball asymptotics in Hilbertian norm for the Kac-Kiefer-Wolfowitz processes [AMS Subj-class] 60G15 Gaussian processes [Abstract] We consider the spectral asymptotics for some integral-differential operators. The problem is reduced to the asymptotic expansion of some integrals containing slowly varying functions. Then we apply obtained results to the problem of small ball behavior in $L_2$-norm for some Gaussian processes of statistical interest. [Keywords] Spectral Asymptotics, Slowly Varying Functions, Gaussian Processes, Small Ball Asymptotics [Comments] LaTeX, Russian, 22 pp. [Contact e-mail] al.il.nazarov@gmail.com