by van Hasselt, D.R.S., Hentschel, V., Hutteman, M., Kaalberg, F.J., van Liebergen, J.C.G., Netzel, H., Snel, A.J.M., Teunissen, E.A.H., de Wit, J.C.W.M.
Published in Tunnelling and underground space technology (01.04.1999)