[666] Zur theorie der fast periodischen funktionen

[667] Principe de moindre action, propagation de la chaleur et estimees sous elliptiques sur certains groupes nilpotents

[668] Mutually stationary sequences of sets and the non-saturation of the non-stationary ideal on$P$_{ϰ}(λ)

[669] On the regularity of difference schemes

[670] Bounded orthogonal systems and the Λ($p$)-set problem