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Ehrenfeucht, A.; Fajtlowicz, S.; Malitz, J.; Mycielski, J. Some problems on the universality of words in groups. (English) Zbl 0388.20030 Algebra Univers. 11, 261-263 (1980). MSC: 20F10 20B07 PDFBibTeX XMLCite \textit{A. Ehrenfeucht} et al., Algebra Univers. 11, 261--263 (1980; Zbl 0388.20030) Full Text: DOI