General conditions for the subadditivityand superadditivity of relations Tamás Glavosits, Arpád Száz 31-43 PDF
On Orbifold Coverings of Genus 2 Surfaces Alexander Hulpke, Tapani Kuusalo, Marjatta Näätänen, Gerhard Rosenberger 45-55 PDF
On the Lambek Invariants of Commutative Squares in a Quasi-Abelian Category Yaroslav Kopylov 57-67 PDF
