Normalizing extensions I -- Normalizing extensions II -- Commutant des Modules de Longueur Finie sur Certaines Algรจbres Filtrรฉes -- Maximal orders applied to enveloping algebras -- Fxtensions of valuations on skew fields -- Extensions of simple by simple unit-regular rings -- Invertible 2ร{151}2 matrices over skew polynomial rings -- Hereditary P. I. algebras -- Grade et Thรฉorรจme dโ{128}{153}intersection en algรจbre Non commutative -- Thรฉorรจme de Hopkins pour les Catรฉgories 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