From the contents: Semiretracts and the Intersection of Retracts (JA Anderson).- Some Inequalities for Linear Extensions of Posets and Ideals (T Bier).- Gröbner-Shirshov Bases for Relations of a Lie Algebra and Its Enveloping Algebra (L Bokut & P Malcolmson).- Constructing Tree Lattices (LJ Carbone).- Regular-solid Varieties of Commutative and Idempotent Groupoids (K Denecke & P Jampachon).- L1-Embeddable Bifaced Polyhedra (M Deza & V Grishukhin).- Nonstandard Representation of the Malcev Clone of a Strong Variety (HJ Hoehnke).- On Rings with Inverse Adjoint Semigroups (AV Kelarev).- On Hamilton Cycles in Caylay Graphs of Order pqr (Li Dengxin).- Implicative Identities in Groups (BH Neumann).- Isomorphism Theorem, Embedding Theorem and Replacement Techniques for Primitive Rings (KP Shum, Xu Yonghua).- On Morphisms between Partial Algebras (HJ Vogel).- Geometry of Matrices Revisited (Zhe-Xian Wan).- Semiperfect Coalgebras over Rings (R Wisbauer).- And other papers.