Table des matieres -- [1] Kollineationen primaerer Praemoduln -- [2] Dualisierbare Moduln und Praemoduln -- [3] Abelian groups G which satisfy G ? G ? K for every direct summand K of G -- [4] Sous-groupes fonctoriels et topologies -- [5] A topology for primary abelian groups -- [6] Automorphismengruppen endlicher abelscher p-gruppen -- [7] Note on purity and algebraic compactness for modules -- [8] Der iterierte Ext-Funktor, seine Periodicitat und die dadurch definierten Klassen abelscher Gruppen -- [9] The Jacobson radical of some endomorphism rings -- [10] Automorphismengesรคttigte Klassen abzรคhlbarer abelschen Gruppen -- [11] Direct sums of countable groups and generalizations -- [12] On topological methods in abelian groups -- [13] Homogeneous decomposable modules -- [14] Endomorphism rings of abelian p-groups -- [15] Extensions of abelian groups -- [16] Sur les propriรฉtรฉs universelles des foncteurs adjoints -- [17] Radical, socle et relativisation -- [18] Torsion and cotorsion completions -- [19] A note on endomorphism rings of abelian p-groups -- [20] An extension of the Ulm-Kolettis theorems -- [21] A class of rank-2 torsion free groups -- [22] Projective classes of abelian groups -- [23] Generalized torsion complete groups