On degeneration of projective curves -- Varietes rationnelles et unirationnelles -- Conic bundles on non-rational surfaces -- Moduli of surfaces of general type -- On a proof of Torelli's theorem -- Two examples of algebraic threefolds whose hyperplane sections are Enriques surfaces -- On the Brill-Noether theorem -- Properties of Arakelov's intersection product -- On nodal curves -- About the enumeration of contacts -- Un probleme du type Brill-Noether pour les fibres vectoriels -- On the construction of rational surfaces with assigned singularities -- Postulation des courbes gauches -- Projective geometry of elliptic curves -- Linkage of general curves of large degree -- Some problems and results on finite sets of points in ?n -- Homogeneous bundles in characteristic p -- The group of sections on a rational elliptic surface -- On the Kodaira dimension of the Siegel modular variety -- Generalized hilbert functions of Cohen-Macaulay varieties -- Some curves in ?3 are set-theoretic complete intersections -- Constructing enriques surfaces from quintics in P K 3 -- Prym surfaces and a Siegel modular threefold.