 1973 Leuwers, Daniel and Ryoske Masuda, Knoll International, Paris (brochure).Pre-1973 Yil, Lee, Kasahara Gallery, Osaka (brochure in Japanese).Matheson, John, “Merely Drops of Water?”

Restany, Pierre, in Kim Tschang-Yeul, Galerie Bhak, Seoul (in English and Korean).