1.
Semigroups : Structure and Universal Algebraic Problems
by Pollak, G., Schwarz, Bertho...
ISBN: 9780444875532
List Price: $128.25
OUT OF STOCK
See Availability on Amazon2.
Quasi Ideals Rings Semi (Disquisitiones mathematicae Hungaricae)
by Steinfeld, O.
ISBN: 9789630516969
List Price: $14.50