A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2022; you can also visit the original URL.
The file type is
On the computation of union-extensions of finite semigroups
In his dissertation of 1968  Verbeek proposed a generalization of the theory of semigroup extensions, which until that date consisted of the two nearly disjoint parts of Schreier-and ideal-extensions. According to Verbeek we define a semigroup extension as follows:dblp:journals/actaC/BrockJ76 fatcat:bdz6bfidmjhofpfmaafr7rtqwq