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	1.	Regular semigroups as extensions/ F. J. Pastijn & M. Petrich. by Pastijn, F. J. (Francis J.) Petrich, Mario Series: Pitman Research Notes in Mathematics Series ; 136. Publication details: Boston: Pitman Advanced Publishing Program, 1985 Availability: Items available for loan: Castorina (1)Call number: 512.2 P291r 1985 IMPA. Found in Open Library: Place hold Add to cart (remove)
	2.	Inverse semigroups/ Mario Petrich. by Petrich, Mario Series: Pure and applied mathematics (John Wiley & Sons : Unnumbered) Publication details: New York: Wiley, [1984] Availability: Items available for loan: Castorina (1)Call number: 512.2 P495i 1984 IMPA. Found in Open Library: Place hold Add to cart (remove)

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