Baer, Reinhold In happy memory of the twenty three fruitful and active semesters spent in Frankfurt. (English) Zbl 1366.01014 Adv. Group Theory Appl. 2, 115-120 (2016). Reproduction of a talk given by Baer in his last lecture in 1967 before his retirement. MSC: 01A60 History of mathematics in the 20th century PDFBibTeX XMLCite \textit{R. Baer}, Adv. Group Theory Appl. 2, 115--120 (2016; Zbl 1366.01014) Full Text: DOI