M. Romer and P. Lienemann, “Versalzung und Korrosion von Spritzbeton (Sicherheitsstollen des Gotthard-Strassentunnels): Deterioration of Shotcrete in the Safety Gallery of the Gotthard Motorway Tunnel by Salt-Containing Water”, Chimia, vol. 52, no. 5, p. 197, May 1998.