1. Holter, K., Bridge, R., Tappy, O., 2010. Design and construction of permanent waterproof tunnel linings based on sprayed concrete and spray-applied double-bonded membrane. In: Int. Conf. Underground Construction – Transport and City Tunnels, Prague, Czech Republic, pp. 121–126.
2. Handbook of Tunnel Engineering I;Maidl,2013
3. Makhlouf, R., Holter, K., 2008. Rehabilitation of concrete lined tunnels using a composite sprayed liner with sprayed concrete and sprayable waterproofing Membrane, The Chekka Road, ITA World Tunnel Congress, Agra, India, pp. 1175-1182.
4. Thewes, M., Vollmann, G., 2007. Applications of a shotcrete robot for creating an immediate comparability of mix-designs. ITA World Tunnel Congress, Prague, Czech Republic, pp. 1377–1382.
5. Sprayed Concrete Lined Tunnels;Thomas,2009