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Semigroups: An Introduction. Springer Science & Business Media. p. 1. ISBN 978-1-84800-281-4. Pierre A. Grillet (1995). Semigroups: An Introduction to the Structure...

Transformation Semigroups: An Introduction. Springer. doi:10.1007/978-1-84800-281-4. ISBN 978-1-84800-281-4. Hollings, Christopher (2014). Mathematics across the...

Introduction. Springer Science & Business Media. pp. 16 and 24. ISBN 978-1-84800-281-4. Martin Davis (1958), Computability and Unsolvability, McGraw–Hill...

Semigroups: An Introduction. Springer Science & Business Media. p. 24. ISBN 978-1-84800-281-4. Herschel, John Frederick William (1820). "Part III. Section I. Examples...