On direct decompositions of torsionfree Abelian groups BJARNI JÓNSSON — 1957 Mathematica Scandinavica
On isomorphism types of groups and other algebraic systems BJARNI JÓNSSON — 1957 Mathematica Scandinavica
On Direct Decomposition of Torsion Free Abelian Groups. Bjarni Jonsson — 1959 Mathematica Scandinavica
Powers of partially ordered sets: The automorphism group. Bjarni Jónsson — 1982 Mathematica Scandinavica
The variety covering the variety of all modular lattices. Bjarni Jonsson — 1977 Mathematica Scandinavica
Algebraic structures with prescribed automorphism groups Bjarni Jónsson — 1968 Colloquium Mathematicae
Powers of partially ordered sets: Cancellation and reffinement properties. Ralph McKenzie; Bjarni Jónsson — 1982 Mathematica Scandinavica