Adalsteinn Ingolfsson, “Glass Art in a Northern Light,” in Neues Glas/Verre Nouveau no. 3/1986, pp. 194–196.   “Concrete and Time Concrete,” in Nordisk Betong 6/1986, p. 13.   Silja Rantanen: “Rúrí,” in Concrete, exh. cat. Helsingin Juhlaviikot. Ibid, 1986, pp. 46–49.