On semigroups which are not divided by any non-trivial semigroup with an identity.
Band decomposition of weakly exponential semigroups.
Weakly exponential semigroups.
WE-m semigroups.
Semigroups whose proper two-sided ideals are power joined.
Subdirectly irreducible completely symmetrical semigroups.
Regular WE-2 semigroups.
Subdirectly irreducible right commutative semigroups.
RC-commutative ...-semigroups.
On the structure of (m,n)-commutative semigroups.
Permutation functions and (n,m)-commutativity of semigroups .
Weakly exponential A-semigroups.
Semilattice decomposition of n(2)-permutable semigroups.
On a problem of n(2)-permutable semigroups.
Deterministic and Stochastic Optimal Control - Fleming, W.H.; Rishel, R.W.
On -commutativity of -permutable semigroups.
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