Dear CCL´ers I´m doing some Molecular Dynamics Simulations and use the Lorentz-Berthelot Mixing Rules for the calculation of intermolecular interactions. Can someone give me a hint were I find something about there Ursprung und assumtions. All i have found is a note in the Book of Allen and Tildesley, that theese rules are old and venerable. thanks in advance, O. Konrad