Normalizing extensions I -- Normalizing extensions II -- Commutant des Modules de Longueur Finie sur Certaines Algèbres Filtrées -- Maximal orders applied to enveloping algebras -- Fxtensions of valuations on skew fields -- Extensions of simple by simple unit-regular rings -- Invertible 2×2 matrices over skew polynomial rings -- Hereditary P. I. algebras -- Grade et Théorème d’intersection en algèbre Non commutative -- Théorème de Hopkins pour les Catégories de Grothendieck -- The moore-penrose inverse for matrices over skew polynomial rings -- The lattice type of orders: A diagrammatic approach. I -- Arithmetically graded rings .I. -- Radicals and chain conditions -- Graded azumaya algebras and brauer groups -- Birationality of P.I. rings and non-commutative varieties -- Skew power series rings and some homological properties of filtered rings.