Quasihomogene affine Varietรคten fรผr SL(2,?) -- Automorphismes des surfaces non completes, groupes fuchsiens et singularites quasihomogenes -- Quelques rรฉsultats et conjectures concernant les sรฉries de Poincarรฉ des invariants des formes binaires -- Interpolation de Newton ร  plusieurs variables -- A constructive characterization of all optimal linear codes -- Actions of formal groups on formal schemes. Applications to control theory and combinatorics -- Complexe bidualisant en algebre non commutative -- The K-theory of filtered rings and skew laurent extensions -- Microlocalisation algebrique -- to the algebraic theory of positive characteristic differential geometry -- Quadratic forms and finite representation type -- The catenarian property of the polynomial rings over a Prรผfer domain -- Ore sets in Noetherian rings -- D-anneaux et anneaux F-semi-parfaits -- Hereditary P.I. algebras