HENRYK IWANIEC The sixtieth birthday of Jean-Marc Deshouillers GAUTAMI BHOWMIK & JAN-CHRISTOPH SCHLAGE-PUCHTA Natural boundaries of Dirichlet series REGIS DE LA BRETECHE & GERALD TENENBAUM Sommes d'exponentielles friables d'arguments rationnels MIREILLE CAR & Luis H. GALLARDO Waring's problem for polynomial biquadrates over a finite field of odd characteristic HENRI COHEN, FRANCOIS DRESS & MOHAMED EL MARRAKI Explicit estimates for summatory functions linked to the Möbius µ-function CÉCILE DARTYGE & MIHÁLY SZALAY Dominant residue classes concerning the summands of partitions HAROLD G. DIAMOND & HEINI HALBERSTAM Some properties of the Ankeny-Onishi function