Gautschi, Walter (2010), "Alexander M. Ostrowski (1893–1986): His life, work, and students"(PDF), math.ch/100: Swiss Mathematical Society, 1910–2010, Zürich: European Mathematical Society Publishing House, pp. 257–278. See in particular p. 263: "This high esteem of scientific merits, regardless of political, personal, or other shortcomings of this attaining them, came across already in 1949, when he [Ostrowski] had the courage of inviting Bieberbach – then disgraced by his Nazi past and ostracized by the European intelligentsia – to spend a semester as guest of the university of Basel and conduct a seminar on geometric constructions."
