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1.	Image from Amazon.com	Regularity properties of functional equations in several var by Jarai, Antal Series: Advances in mathematics Material type: Text Publication details: New York Springer-Verlag 2005 Availability: Items available for loan: IGIDR (1)Collection, call number: 515.7/JAR. Found in Open Library: Place hold Save to lists
2.	Image from Amazon.com	Functional equations and inequalities with applications by Kannappan, Pl Material type: Text Publication details: Berlin Springer-Verlag 2009 Availability: Items available for loan: IGIDR (1)Collection, call number: 515.8/KAN. Found in Open Library: Place hold Save to lists
3.	Image from Amazon.com	Functional equations and inequalities : Solutions and stability results / John Michael Rassias et al by Rassias, John Michael et al Series: Series on concrete and applicable mathematics ; 21 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Singapore World Scientific 2017 Availability: Items available for loan: IGIDR (1)Collection, call number: 515.72 RAS. Found in Open Library: Place hold Save to lists