Quasi-injective S -systems and their S -endomorphism semigroup Antonio M. Lopez, Jr., John K. Luedeman (1979) Czechoslovak Mathematical Journal
Quelques constructions et algorithmes relatifs aux sous-monoïdes d'un monoïde libre. J.C. Spehner (1974) Semigroup forum
Quelques problèmes posés par l'étude combinatoire des semigroupes Marcel P. Schützenberger (1975/1976) Groupe d'étude d'algèbre Groupe d'étude d'algèbre
Quotient monoids and greatest commutative monoid images of several types. T. Head (1979) Semigroup forum
Radicals of Green’s relations Stojan Bogdanović, Miroslav Ćirić (1999) Czechoslovak Mathematical Journal Some structural descriptions of semigroups in which the radicals of Green’s relations are semilattice congruences will be given.
Realization theorems for semigroups with divisor theory. A. Geroldinger, F. Halter-Koch (1992) Semigroup forum
Reconstructing some idempotent-generated semigroups from their biordered sets. T.E. Hall, D. Easdown (1984) Semigroup forum
Regular 4-spiral semigroup, I.G. semigroups and the Rees construction. K. Byleen (1981) Semigroup forum