Claret, F., Sakharov, B.A., Drits, V.A., Velde, B., Meunier, A., Griffault, L. and Lanson, B. (2004) Clay minerrals in the Meuse-Haute Marne Underground Laboratory (France): Possible influence of organic matter on clay mineral evolution. Clays and Clay Minerals, 52, 515-532.