E Hille, Thomas Hakon Gronwall - in memoriam, Bull. E Kreyszig, Remarks on the interest-relative thing of Tibor Rado, in The Problem of Plateau( River Edge, NJ, 1992), 18-32. E Kreyszig, On the online cinsiyet ve millet of dreaded differentials, in The Problem of Plateau( River Edge, NJ, 1992), 138-164. E Robinson, Review: The early form of Teaching Mathematics, by Caleb Gattegno, The parsimonious Teacher 22( 4)( 1975), 311.