Stetkær, H. (2013). Functional equations on groups. World Scientific.
Tohutoru Kātū Chicago (17th ed.)Stetkær, Henrik. Functional Equations on Groups. Singapore ; Hackensack, N.J.: World Scientific, 2013.
Tohutoro MLA (9th ed.)Stetkær, Henrik. Functional Equations on Groups. World Scientific, 2013.
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