Scimemi, B. Binary systems constructed on a group. (Italian) Zbl 0577.20060 Sistemi binari e loro applicazioni, Conv. Taormina/Messina 1978, 87-97 (1978). Reviewer: M.Ştefănescu MSC: 20N05 20A05 PDFBibTeX XML
Kannappan, PL.; Sathyabhama, V. On the generalized ’extra’ functional equation. (English) Zbl 0434.39011 Indian J. Math. 20, 15-23 (1978). MSC: 39B52 20N05 PDFBibTeX XMLCite \textit{PL. Kannappan} and \textit{V. Sathyabhama}, Indian J. Math. 20, 15--23 (1978; Zbl 0434.39011)