1. Andrén A. (2009). "Degradation of rock and shotcrete due to ice pressure and frost shattering." Licentiate Thesis Luleå University of Technology Luleå.
2. Tunnel maintenance in Japan
3. Axelsson M. (2009). "Prevention of erosion of fresh grout in hard rock." Ph.D. Thesis Chalmers University of Technology Gothenburg Sweden.
4. Björnström J. (2005). "Influence of nano-silica and organic admixtures on cement hydration: A mechanistic investigation." University of Gothenburg Gothenburg Sweden.
5. Andrén A. (2009). "Degradation of rock and shotcrete due to ice pressure and frost shattering." Licentiate Thesis Luleå University of Technology Luleå.