 Matheson, John, in Kim Tschang-Yeul, Staempfli Gallery, New York, pp48–55 (in French and English).Staempfli, George W., “Introduction” in Kim Tschang-Yeul, Staempfli Gallery, New York, pp6–7 (in
French and English).1978 Ufan, Lee, “Fra l’idea e la material” (“Between the Idea and the Material”), Galleria del Naviglio, Milan
(in Italian).