Płonka, E. Symmetric operations in groups. (English) Zbl 0184.04103 Bull. Acad. Pol. Sci., Sér. Sci. Math. Astron. Phys. 17, 481-482 (1969). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:group theory PDFBibTeX XMLCite \textit{E. Płonka}, Bull. Acad. Pol. Sci., Sér. Sci. Math. Astron. Phys. 17, 481--482 (1969; Zbl 0184.04103)